LG ELECTRONICS LGP2300W SINGLE-BAND PCS CDMA PHONE User Manual ServiceManual

LG Electronics, Inc. SINGLE-BAND PCS CDMA PHONE ServiceManual

Contents

Service Manual

1 LG Information & Communications, Ltd.- 1 -Features of Mobile Subscriber RadioFeatures of Mobile Subscriber RadioTelephone SetTelephone Set(LG(LGPP--2300/23102300/2310 W Type)W Type)1. Wave Type : G7W2. Frequency Scope • Send Frequency : 1850~1910MHz • Receive Frequency : 1930~1990MHz3. Rated Output • 360mW4. Output Conversion Method : This is possible by correcting the key board channel.5. Voltage and Current Value of Termination Part Amplifier(Catalogue included)Product Type Name Voltage Current PowerPWR AMP RI-21108U 5.0V 450mA 250mW6. Functions of Major Semi-ConductorsClassification Function MSM3000-PBGA Terminal operation control and digital signal processing FLASH MEMORY & STATIC RAM(MB84VA2103-10)Flash Memory (16Mbit) Õ Storing of terminal operation programSRAM (2Mbit) Õ Temporary storing of the data created while busyIFR3000 Converts IF signal into digital baseband signalIFT3000 Converts digital baseband signal to IF signal7. Frequency Stability • ±0.1PPM
LGP-2300/2310W LG Information & Communications, Ltd. - 1 - CDMA Mobile Subscriber Unit LGP-2300/2310W SERVICE MANUAL
LGP-2300/2310W LG Information & Communications, Ltd. - 2 -
LGP-2300/2310W LG Information & Communications, Ltd. - 3 -Table of ContentsTable of ContentsGeneral Introduction ...................................................................................................................................................................... 3CHAPTER 1. System Introduction 1. System Introduction ..................................................................................................................................... 4 2. Features and Advantages of CDMA Mobile Phone ...................................................................................... 4 3. Structure and Functions of CDMA Mobile Phone ........................................................................................ 8 4. Specification .................................................................................................................................................. 9 5. Installation ................................................................................................................................................... 12CHAPTER 2. NAM Input Method(Inputting of telephone numbers included) 1. Telephone Number Input Method ................................................................................................................14 2. NAM Program Method ............................................................................................................................... 14CHAPTER 3. Circuit Description 1. RF Transmit/Receive Part ........................................................................................................................... 15 2. Digital/Voice Processing Part ..................................................................................................... 20CHAPTER 4. Trouble Shooting ................................................................................................................................................... 24CHAPTER 5. Test Procedure ................................................................................................................................................... 31Appendix ................................................................................................................................................... 32 1. Assembly and Disassembly Diagram 2. Block & Circuit Diagram 3. Part List 4. Component Layout 5. Accessories - Desktop Charger - Travel Charger - Hands Free Kit - Cigar Light Charger - Data Kit 6. WLPST ( LGIC Product Support Tool For Win95 )
LGP-2300/2310W LG Information & Communications, Ltd. - 4 -The LGP-2300/2310W is a 1.9GHz CDMA(Code Division Multiple Access) PCS phone. CDMA technologywith this phone adopts DSSS(Direct Sequence Spread Spectrum) ,which is also used in the military.This feature of DSSS enables the phone to keep communication from being crossed and to use one frequencychannel by multiple users in the same specific area, resulting that it increases the capacity 10 times morecompared with that in the analog mode currently used.Soft/Softer Handoff, Hard Handoff, and Dynamic RF power Control technologies are combined into this phoneto reduce the call being interrupted in a middle of talking over the phone.A CDMA PCS network consists of MSC (Mobile Switching Center), BSC (Base Station Controller), BTS (Basestation Transmission System), and MS (Mobile Station). Communication between MS and BTS is designed tomeet the specification of ANSI J-STD-008 (Common Air Interface). MS meets the specifications of the below:- ANSI J-STD-008 Personal Station - Base Station Compatibility Requirements for 1.8 to 2.0GHz CDMA PCS- ANSI J-STD-018 Recommended Minimum Performance Requirements for 1.8 to 2.0 GHzCDMA Personal Stations- TIA/EIA IS-126-A Mobile Station Loopback Service Options Standard- TIA/EIA IS-127 Enhanced Variable Rate Voice Coder- TIA/EIA IS-683 Over-the-Air Service Provisioning of Mobile Stations in Wideband SpreadSpectrum Systems- TIA/EIA-IS-707 Data Service Options for Wideband Spread Spectrum SystemsLGP-2300/2310W is composed of transceiver, desktop charger, Li-Ion Battery (1600mAh), hands-free kit,travel charger, cigar light charger and data kit. Hands-free kit is designed to operate in fullduplex. General Introduction
LGP-2300/2310W5 LG Information & Communications, Ltd.- 5 -1. System Introduction1.1 CDMA AbstractCurrently,2 methods of PCS services are in use worldwide; One is TDMA and the other is CDMA. DCS-1800,which is based on the GSM protocol , TDMA technology, and 1.8GHz frequency range is in service inmany areas including Europe. Japanese PHS(Personal Handy-phone System) is based on the TDMA/TDDtechnoogy and uses 1.9GHz frequency range. Meanwhile,in the United States,both of PCS-1900,a TDMAstandard,and J-STD-018,a CDMA standard have been adopted commercially.CDMA system can be explained as follows: TDMA or SDMA can be used to enable each person to talkalternately or provide a separate room for each person when two persons desire to talk with each other at thesame time, whereas FDMA can be used to enable one person to talk in soprano, whereas the other in bass (oneof the two talkers can carry out synchronization for hearing in case there is a bandpass filter function in the areaof the hearer).Another method available is to make two persons to sing in different languages at the same time, space, andfrequency when wishing to let the audience hear the singing without being confused. This is the characteristicsof CDMA. On the other hand, when employing the CDMA technology, each signal has a different pseudo-random binarysequence used to spread the spectrum of carrier. A great number of CDMA signals share the same frequencyspectrum. In the perspective of frequency area or time area, several CDMA signals are overlapped. Among thesetypes of signals, only desired signal energy is selected and received through the use of pre-determined binarysequence; desired signals can be separated and then, received with the correlator used for recovering thespectrum into its original state. At this time, the spectrums of other signals that have different codes are notrecovered into its original state and instead, processed as noise and appears as the self-interference of the system.2. Features and Advantages of CDMA Mobile Phone2.1 Various Types of DiversitiesWhen employing the narrow band modulation (30kHz band) such as the analog FM modulation used in theexisting cellular system, the multi-paths of radio waves create a serious fading. However, in the CDMAbroadband modulation(1.25MHz band), three types of diversities (time, frequency, and space) are used to reduceserious fading problems generated from radio channels in order to obtain high-quality calls. Time diversity can be obtained through the use of code interleaving and error correction code whereasfrequency diversity can be obtained by spreading signal energy to wider frequency band. The fading related tonormal frequency can affect the normal 200~300kHz among signal bands and accordingly, serious effect can be CHAPTER 1. System Introduction
LGP-2300/2310W LG Information & Communications, Ltd. - 6 -avoided. Moreover, space diversity (also called path diversity) can be realized with the following three types ofmethods.First, it can be obtained by the duplication of cell site receive antenna. Second, it can be obtained through theuse of multi-signal processing device that receives a transmit signal having each different transmission delaytime and then, combines them. Third, it can be obtained through the multiple cell site connection (Soft Handoff)that connects the mobile station with more than two cell sites at the same time.2.2 Power ControlThe CDMA system utilizes the forward (from a base station to mobile stations) and backward (from the mobilestation to the base station) power control in order to increase the call processing capacity and obtain high-qualitycalls. In case the originating signals of mobile stations are received by the cell site in the minimum call qualitylevel (signal to interference) through the use of transmit power control on all the mobile stations, the systemcapacity can be maximized.If the signal power of mobile station is received too strong, the performance of thatmobile station is improved. However, because of this, the interference on other mobile stations using the samechannel is increased and accordingly, the call quality of other subscribers is reduced unless the maximumaccommodation capacity is reduced.In the CDMA PCS system, forward power control, backward open loop power control, and closed loop powercontrol methods are used. The forward power control is carried out in the cell site to reduce the transmit poweron mobile stations less affected by the multi-path fading and shadow phenomenon and the interference of othercell sites when the mobile station is not engaged in the call or is relatively nearer to the corresponding cell site.This is also used to provide additional power to mobile stations having high call error rates, located in badreception areas or far away from the cell site.The backward open loop power control is carried out in a corresponding mobile station; the mobile stationmeasures power received from the cell site and then, reversely increases/decreases transmit power in order tocompensate channel changes caused by the forward link path loss and terrain characteristics in relation to themobile station in the cell site. By doing so, all the mobile transmit signals in the cells are received by the cell sitein the same strength. Moreover, the backward closed loop power control used by the mobile station is to control power with thecommands issued out by the cell site. The cell site receives the signal of each corresponding mobile station andcompares this with the pre-set threshold value and then, issues out power increase/decrease commands to thecorresponding mobile station every 1.25msec (800 times per second). By doing so, the gain tolerance and thedifferent radio propagation loss on the forward/backward link are complemented.2.3 Voice Encoder and Variable Data Speed The bi-directional voice service having variable data speed provides voice communication which employs voiceencoder algorithm having power variable data rate between the mobile telephone cell site and mobile station. Onthe other hand, the transmit voice encoder performs voice sampling and then, creates encoded voice packets tobe sent out to the receive voice encoder, whereas the receive voice encoder demodulates the received voicepackets into voice samples. One of the two voice encoders described in the above is selected for use depending on inputted automatic
LGP-2300/2310W LG Information & Communications, Ltd. - 7 -conditions and message/data; both of them utilize four-stage frames of 14400,7200,3600,1800 bits per second.In addition, this type of variable voice encoder utilizes adaptive threshold values when selecting required datarate. It is adjusted in accordance with the size of background noise and the data rate is increased to high rate onlywhen the voice of caller is inputted. Therefore, background noise is suppressed and high-quality voice transmission is possible under theenvironment experiencing serious noise. In addition, in case the caller does not talk, data transmission rate isreduced so that the transmission is carried out in low energy. This will reduce the interference on other CDMAsignals and as a result, improve system performance (capacity increased by about two times). Also,compared to the existing CDMA cellular system’s 9600 bps vocoder rate,the PCS’ vocoder rate is up to14400 bps, providing relatively better voice quality (almost twice better than the existing 800MHz CDMAcellular system) almost comparable to the landline service.2.4 Protecting Call Confidentiality CDMA signals have the function of effectively protecting call confidentiality by spreading and interleaving callinformation in broad bandwidth. This makes the unauthorized use of crosstalk, search receiver, and radio veryhard substantially. Also included is encryption function on various authentication and calls for the doubleprotection of call confidentiality.2.5 Soft HandoffDuring the soft hand-off, the cell site already in the busy state and the cell site to be engaged in the call laterparticipate in the call conversion. The call conversion is carried out through the original call connection cell site,both cell sites, and then, new cell site. This method can minimize call disconnection and prevent the user fromdetecting the hand-off.2.6 Frequency Re-Use and Sector Segmentation Unlike the existing analog cellular system, the CDMA system can reuse the same frequency at the adjacent celland accordingly, there is no need to prepare a separate frequency plan. Total interference generated on mobilestation signals received from the cell site is the sum of interference generated from other mobile stations in thesame cell site and interference generated from the mobile station of adjacent cell site. That is, each mobilestation signal generates interference in relation to the signals of all the other mobile signals. Total interference from all the adjacent cell sites is the ratio of interference from all the cell sites versus totalinterference from other mobile stations in the same cell site (about 65%). In the case of directional cell site, onecell normally uses a 120°sector antenna in order to divide the sector into three. In this case, each antenna isused only for 1/3 of mobile stations in the cell site and accordingly, interference is reduced by 1/3 on the averageand the capacity that can be supported by the entire system is increased by three times.
LGP-2300/2310W LG Information & Communications, Ltd. - 8 -2.7 Soft Capacity The subscriber capacity of the CDMA system is flexible depending on the relation between the number of usersand service classes. For example, the system operator can increase the number of channels available for useduring the busy hour despite the drop in call quality. This type of function requires 40% of normal call channelsin the standby mode during the handoff support, in an effort to avoid call disconnection resulting from the lackof channels.In addition, in the CDMA system, services and service charges are classified further into different classes so thatmore transmit power can be allocated to high class service users for easier call set-up; they can also be givenhigher priority of using hand-off function than the general users.
LGP-2300/2310W LG Information & Communications, Ltd. - 9 -3. Structure and Functions of CDMA Mobile Phone The mobile station of the CDMA system is made up of a radio frequency part and a logic/control (digital) part.The mobile station antenna is connected with the transmitter/receiver via a duplexer filter so that it can carry outthe transmit/receive function at the same time.The transmit frequency is the 60MHz band of 1850~1910MHz , whereas the receive frequency is the 60MHzband of 1930~1990MHz. The transmit/receive frequency is separated by 20MHz. The RF signal from theantenna is converted into intermediate frequency(IF) band by the frequency synthesizer and frequency downconverter and then, passes the bandpass SAW filter having the 1.25MHz bandwidth. The IF output signals thathave been filtered from spurious signals are converted into digital signals via an analog-to-digitalconverters(ADC) and then, sent out respectively to 5 correlators in each CDMA de-modulator. Of these, one iscalled a searcher whereas the remaining 4 are called data receivers(fingers). Digitalized IF signals include a greatnumber of call signals that have been sent out by the adjacent cells. These signals are detected with pseudo-noisesequence (PN Sequence). Signal to interference ratio (C/I) on signals that match the desired PN sequence areincreased through this type of correlation detection process. Then, other signals obtain processing gain by notincreasing the ratio. The carrier wave of pilot channel from the cell site most adjacently located is demodulatedin order to obtain the sequence of encoded data symbols. During the operation with one cell site, the searchersearches out multi-paths in accordance with terrain and building reflections. On three data receivers, the mostpowerful 3 paths are allocated for the parallel tracing and receiving. Fading resistance can be improved a greatdeal by obtaining the diversity combined output for de-modulation. Moreover, the searcher can be used todetermine the most powerful path from the cell sites even during the soft handoff between the two cell sites.Moreover, 3 data receivers are allocated in order to carry out the de-modulation of these paths. Data output thathas been demodulated change the data string in the combined data row as in the case of originalsignals(deinterleaving), and then, are de-modulated by the forward error correction decoder which uses theViterbi algorithm. On the other hand, mobile station user information sent out from the mobile station to the cell site pass throughthe digital voice encoder via a mike. Then, they are encoded and forward errors are corrected through the use ofconvolution encoder. Then, the order of code rows is changed in accordance with a certain regulation in order toremove any errors in the interleaver. Symbols made through the above process are spread after being loaded ontoPN carrier waves. At this time, PN sequence is selected by each address designated in each call.Signals that have been code spread as above are digital modulated (QPSK) and then, power controlled at theautomatic gain control amplifier (AGC Amp). Then, they are converted into RF band by the frequencysynthesizer synchronizing these signals to proper output frequencies.Transmit signals obtained pass through the duplexer filter and then, are sent out to the cell site via the antenna.
LGP-2300/2310W LG Information & Communications, Ltd. - 10 -4. Specification4.1 General Specification4.1.1 Transmit/Receive Frequency Interval : 80 MHz4.1.2 Number of Channels (Channel Bandwidth) : 484.1.3 Operating Voltage : DC 3.8V4.1.4 Battery Power Consumption : DC 3.8VSLEEP IDLE MAX POWERCDMA 3 mA100 mA 450 mA (24 dBm)4.1.5 Operating Temperature : -20°° ~ +60°°4.1.6 Frequency Stability : ±±0.1PPM4.1.7 Antenna : Retractable Type (Herical+Whip), 50 W4.1.8 Size and Weight1) Size : 126523.7548( , L 5 D 5 W)2) Weight : 155g (approximately with extended battery)4.1.9 Channel Spacing : 1.25MHz4.1.10 Battery Type, Capacity and Orerating Time. ( condition: Slot Cycle 2)Extended (1600mAh)Stand-By Time CDMA 200 Hrs.(SCI = 2)Talk Time CDMA 180 Min.(typical duplexer,10dBm output)4.2 Receive Specification4.2.1 Frequency Range : 1930 MHz ~ 1990MHz 4.2.2 Local Oscillating Frequency Range : 1719.62MHz ∼∼ 1779.62MHz4.2.3 Intermediate Frequency : 210.38MHz
LGP-2300/2310W LG Information & Communications, Ltd. - 11 -4.2.4 Sensitivity : -104dBm ( or more)4.2.5 Selectivity : 3dB C/N Degration (With Fch±1.25 kHz : -30dBm)4.2.6 Spurious Wave Suppression : Maximum of -80dB4.2.7 CDMA Input Signal Range • Dynamic area of more than -104~ -25 dB : 79dB at the 1.23MHz band.4.3 Transmit Specification4.3.1 Frequency Range : 1850 MHz ~ 1910 MHz4.3.2 Local Oscillating Frequency Range : 1719.62MHz ∼∼ 1779.62MHz4.3.3 Intermediate Frequency : 130.38 MHz4.3.4 Output Power : 360mW4.3.5 Interference Rejection 1) Single Tone : -30dBm at 900 kHz 2) Two Tone : -43dBm at 900 kHz & 1700kHz4.3.6 CDMA TX Frequency Deviation : ±± 150Hz4.3.7 CDMA TX Conducted Spurious Emissions • 900kHz : - 42 dBc/30kHz below • 1.98MHz : - 54 dBc/30kHz below4.3.8 CDMA Minimum TX Power Control : - 50dBm below4.4 MS (Mobile Station) Transmitter FrequencyCh # Center Freq. Ch # Center Freq. Ch # Center Freq.25 1851.25 425 1871.25 825 1891.2550 1852.50 450 1872.50 850 1892.5075 1853.75 475 1873.75 875 1893.75100 1855.00 500 1875.00 900 1895.00
LGP-2300/2310W LG Information & Communications, Ltd. - 12 -125 1856.25 525 1876.25 925 1896.25150 1857.50 550 1877.50 950 1897.50175 1858.75 575 1878.75 975 1898.75200 1860.00 600 1880.00 1000 1900.00225 1861.25 625 1881.25 1025 1901.25250 1862.50 650 1882.50 1050 1902.50275 1863.75 675 1883.75 1075 1903.75300 1865.00 700 1885.00 1100 1905.00325 1866.25 725 1886.25 1125 1906.25350 1867.50 750 1887.50 1150 1907.50375 1868.75 775 1888.75 1175 1908.754.5 MS (Mobile Station) Receiver FrequencyCh # Center Freq. Ch # Center Freq. Ch # Center Freq.25 1931.25 425 1951.25 825 1971.2550 1932.50 450 1952.50 850 1972.5075 1933.75 475 1953.75 875 1973.75100 1935.00 500 1955.00 900 1975.00125 1936.25 525 1956.25 925 1976.25150 1937.50 550 1957.50 950 1977.50175 1938.75 575 1958.75 975 1978.75200 1940.00 600 1960.00 1000 1980.00225 1941.25 625 1961.25 1025 1981.25250 1942.50 650 1962.50 1050 1982.50275 1943.75 675 1963.75 1075 1983.75300 1945.00 700 1965.00 1100 1985.00325 1946.25 725 1966.25 1125 1986.25350 1947.50 750 1967.50 1150 1987.50375 1948.75 775 1968.75 1175 1988.754.6 Desktop Charger : See Appendix4.7 Travel Charger : See Appendix
LGP-2300/2310W LG Information & Communications, Ltd. - 13 -4.8 Hands-Free Kit : See Appendix5. Installation5.1 Installing a Battery Pack1) The Battery pack is keyed so it can only fit one way. Align the groove in the battery pack with the rail on theback of the phone until the battery pack rests flush with the back of the phone.2) Slide the battery pack forward until you hear a “click”, which locks the battery in place.5.2 For Desktop Charger Use1) Plug the charger into a wall outlet. The charger can be operated from a 110V source. When AC power isconnected to the desktop charger, both the green and red LED’s blink once.2) Insert the phone with the installed battery pack or a battery pack into the battery pack slot. Red light indicatesbattery is being charged.. Green light indicates battry is fully charged.5.3 For Mobile Mount5.3.1 Installation PositionIn order to reduce echo sound when using the Hands-Free Kit, make sure that the speaker and microphone arenot facing each other and keep microphone a generous distance from the speaker.5.3.2 Cradle InstallationChoose an appropriate flat surface where the unit will not interface with driver’s movement or passenger’scomfort. The driver/user should be able to access the phone with ease. Using the four self-tapping screwsprovided, mount the supplied braket on the selected area. Then with the four machine screws provided, mountthe counterpart on the reverse side of the reverse side of the cradle. Secure the two brackets firmly together byusing the two bracket joint screws provide. The distance between the cradle and the interface box must notexceed the length of the main cable.5.3.3 Interface BoxChoose an appropriate flat surface ( somewhere under the dash on the passenger side is preferred ) and mountthe IB bracket with the four self-tapping screws provided. Clip the IB into the IB bracket.5.3.4. Microphone Installation
LGP-2300/2310W LG Information & Communications, Ltd. - 14 -Install the microphone either by cliiping I onto the sunvisor (driver’s side) or by attaching it to door post(driver’s side), using a velcno adhesive tape (not included).5.3.5 Cable Connections5.3.5.1 Power and Ignition CablesConnect the red wire to the car battery positive terminal and the black wire to the car ground. Connect the greenwire to the car ignition sensor terminal. ( In order to operate HFK please make sure to connect green wire toignition sensor terminal.) Connect the kit’s power cable connector to the interface box power receptacle.5.3.5.2 Antenna Cable ConnectionConnect the antenna coupler cable connector from the cradle to the external antenna connector. ( Antenna is notincluded.)
LGP-2300/2310W LG Information & Communications, Ltd. - 15 -1. Telephone Number Inputting MethodTelephone numbers can be inputted as follows in LGP2300W.− − Press MENU+4+0 and then, press the password made up of six digits(Default:000000). 1) You can see ESN number : Press [ ok ]2) You can see “ NAM1 PHONE NUMBER” : types proper phone number and press [ ok ]3) Press [ok] ; press [ok]2. NAM Program MethodThe NAM inputting method of LGP2300W is as follows.- Press MENU+4+0.- Press the password made up of six digits (Default:000000).1) You can see ESN number : Press [ ok ] : If you press [akey] then you can insert akey with CRC checksum2) You can see “ NAM1 PHONE NUMBER” : types proper phone number and press [ ok ]3) You can see “ NAM1 HOME SID ” : types proper SID number and press [ ok ]4) You can see “ NAM1 NAME “: types proper NAM name and press [ EXIT] or [MORE]If you choose [MORE] then following procedures are added5) You can see “SERVICE SEC. CODE” : type security code number of just [ ok ]6) You can see “NAM 1 MOBILE COUNTRY CODE” : types proper country codes number and press[ ok ]7) You can see “NAM 1 NMSID” : press[ ok ]- If you changed your phone number then you can see NMSID is changed to your 0000+phonenumber.8) You can see “PHONE MODEL “: press [ ok ]9) You can see “SLOT CYCLE INDEX” :types proper Slot cycle index and press [ ok ]10) You can see “EXIT service programming” and phone will be rested. CHAPTER 2. NAM Input Method (Inputting of telephone numbersincluded)
LGP-2300/2310W LG Information & Communications, Ltd. - 16 -1. RF Transmit/Receive Part1.1 OverviewThe RF transmit/receive part employs the Super-Heterodyne system. The transmit/receive frequency isrespectively 1850~1910 MHz and 1930~1990 MHz and the block diagram is shown in Appendix .RF signals received through the antenna pass through the duplexer and then are fed into a low noise amplifier(LNA). Following this,the signals are inputted to a mixer(down converter),where the local oscillation signalfrom the frequency synthesizer and the received signals are mixed,thereby generate the intermediatefrequency(IF) signals. This IF signals (210.38MHz) are band-pass filtered, adjusted through theAGC,demodulated to the baseband digital signals,and finally put into the MSM(Mobile Station Modem).Follwing this,the signals are bandpass filtered at a RX SAW filter and fed into a 2nd RF amplifier.Then at thedown-mixer, they are combined with the signals of a local oscillator (VCO) mixer in order to create intermediatefrequency. The intermediate frequency created is sent out to an IF SAW filter, and then fed into an IFR3000(Baseband ASIC). While being processed through the IFR3000,the signals are power-controlled by the AGCpart ,then down-converted by the IF mixer and then converted to digital baseband by the ADC(A/D Converter)part. The digital baseband signals are now sent to the MSM,where they are demodulated by themodulator/demodulator.While in transmission,the MSM3000 sends digital modulated signals to the IFT3000. While being processedthrough the IFT3000,the digital baseband signals from the MSM are first converted to analog baseband by theDAC part ,then up-converted to IF by the IF mixer part, and then power-controlled by the AGC part. The IFsignals are now bandpass filtered by an IF SAW filter,and then fed into an up-mixer,where they are mixed withthe VCO signals and converted to RF.Then,they are bandpass filtered at a RF SAW filter,sent through the driveamp part,bandpass filtered again at another RF SAW filter ,and finally amplified at the PAM. Finally, they aresent out to the cell site via the antenna after going through the duplexer.CHAPTER 3. Circuit Description
LGP-2300/2310W LG Information & Communications, Ltd. - 17 - [Figure 1-1] Block Diagram of RF Transmit/Receive Part1.2 Description of Receive Part Circuit1.2.1 Duplexer (DP1)The duplexer(DP1) consists of a receive part bandpass filter (BPF) and a transmit part bandpass filter(BPF). Itsfunction is separating transmit/receive signals in the full duplex system using the transmit/receive commonantenna. The transmit part BPF is used to suppress noises and spurious waves entering the receive band amongtransmit signals in order to prevent the drop in receive sensitivity characteristics. The receive part BPF blocksthe signals sent out from entering the receive end in order to improve sensitivity characteristics.In addition, it suppresses video signals on IF signals. Insertion loss (IL) in the transmit band is 3.6dB (Max),whereas IL in the receive band is 4.5dB (Max). The receive band attenuation amount of transmit filter is 37dB(Min) and the transmit band attenuation amount of receive filter is 47dB or more (Min).1.2.2 Receive End RF circuitryThe RF signals from the duplexer are first fed into the LNA(U201) ,and the maximally amplified signals (withnoise figure of 1.8dB) from the LNA is then filtered by a BPF (U202) and amplified again by an RF
LGP-2300/2310W LG Information & Communications, Ltd. - 18 -amplifier(U203). At the down-converter(U204),the amplified signals from the RF amplifier are mixed with theUHF local oscillation signals from the frequency synthesizer,generating the added and the subtracted frequencycomponents.As for the down-converter,we used a double balanced mixer in order to minimize the interferencebetween the local oscillation signals and the IF signals. The major output from the down-converter are thesignals at 210.38MHz.At this time,the gain of the LNA is 11dB,the insertion loss(IL) of the BPF is up to 3.5dB,and the attenuation in the transmit band (1850 – 1910 MHz) is 20dB(min).Also,the conversion loss of the RFamplifier and the down-converter are 11dB and 6dB respectively.1.2.3 Receive End IF processing circuitryThe Receive end IF processing circuitry is composed of an IF BPF(U205), an IF AGC amplifier, an IF frequencysynthesizer,and a QPSK demodulator.Of these,the IF AGC amplifier, the IF frequency synthesizer,and the QPSKdemodulator are all in one chip(IFR3000,U402).The IF signals from the down-converter(U204) are first fed into a matching circuitry and then into an IFBPF(U205).As for the BPF,we adopt the SAW filter,which meets attenuation of 30dB(Min) outside the passband,thereby enhancing the RX sensitivity and the spurious suppression.After passing through the SAW filter,the IF signals of 210.38MHz are fed into the AGC amplifier,where thesignals are amplified or attenuated. The dynamic range of the AGC circuitry is 80dB(Min). This type of gaincontrol is the power adjustment function used to reduce the loss resulting from the receive power of mobileterminal by maintaining the signal strength at the AGC input even if the received signals change according tothe location of mobile terminal user.the AGC gain is controlled by varying the DC voltage on the voltagecontrol input pin. The signals ,after the AGC amplifier stage,are input to the QPSK demodulator. The combinedprocessing of the QPSK demodulator and the frequency synthesizer demodulate the received signals intobaseband signals. Then,the signals are sent out to the IFR3000’s LPFs.1.2.4 AD conversion circuitry of the received signalsThe IF receive signals centered at 210.38MHz with the bandwidth of ±630kHz are converted into I and Qbaseband signals at the QPSK demodulator.With CDMA,the baseband is defined as from 1kHz to 630kHz. Forthe CDMA LPF in this stage, signals from above 750kHz are considered unwanted.IF, together with the in-band loss and out-of-band suppression characteristics of the LPF, contributes to theenhancement of Rx sensitivity from the jamming effects of spurious signals. The use of I_OFFSET, Q_OFFSETcontrol signals is for enhancing the received signals’ sensitivity fed into the digital circuitry by adjusting theADC inputs’ offsets. These control signals are generated from the MSM(U503).The CDMA ADC outputs digital signals on the falling edge of the 9.8304MHz clock. The CHIPx8 ADC clockfrequency of 9.8304MHz is generated from the VCTCXO(U101)of 19.68MHz.1.3 Transmit End Circuit Description
LGP-2300/2310W LG Information & Communications, Ltd. - 19 -1.3.1 Description on the analog conversion circuitryThe IFT3000(U401) receives digital I/Q baseband data from the MSM chip(U503). The 8 bit transmit data aremultiplexed and put into the IFT3000’s DAC(Digital to Analog Converter). The input data are fed into I DACon the rising edge of the transmit clock,and fed into the Q DAC on the falling edge. The I and Q data are fed infrom the MSM with 1/2 clock cycle’s difference. In order to filter out unwanted frequency components fromeach of the DAC outputs, BPFs with 630KHz’s bandwidth are used.1.3.2 Transmit End IF processing circuitryThe transmit End IF signal processing circuitry is composed of QPSK modulator (U401), frequency synthesizer(U401), AGC amplifier(U401),IF BPF(U301),Mixer(up-mixer,U302). The IFT3000 includes a programmableTx PLL for synthesizing the TxIF frequency.The TxVCO oscillates at twice of the TxIF frequency. The260.76MHz created in the IFT3000’s internal VCO are divided by half into frequency 130.38MHz having thephase difference of 90 degrees. The I and Q baseband components from the DAC are mixed in quadrature withthe TxIF frequency and added again to generate a modulated waveform centered at 130.38MHz IF frequency.The resulting signals are then fed into the AGC amplifier. A gain control signal TX_AGC_ADJ from the MSMis used to control the AGC operation. The signals from the AGC amplifier go through the matching circuitryfirst,IF BPF(U301) next,and then are fed into the RF up mixer(U302).The operation of the transmit end IF BPFis the same as that of the receive end IF BPF.The upconverter mixes the local oscillation signals in the UHFband with the 130.38MHz IF signals,thereby generating the subtracted and added frequency components. At thispoint,the local oscillation signals from the frequency synthesizer are separated into transmit and receive localoscillation signals respectively by a directional coupler. When the transmit signals and local oscillation signalsare put into the upmixer,the nonlinear characteristics of the transistor generates combined signals of the 2 inputsignals,out of which the UHF band frequency will be output as the major one.1.3.3 Transmit End RF signal processing circuitryThe signals from the upmixer are inputted to a TX RF BPF(U303). It’s a SAW filter ( Surface Acoustic Wave)with IL(Insertion Loss) of 3.5dB(Max),and with the attenuation of 20dB(Min) in the Rx band and the localoscillation band. There are 2 of this BPF in the Tx chain. We placed drive amps(U304,U305) with an averagegain of 20dB between the 2 BPFs. The drive amps were cascade-designed using Siemens’ BFP450 transistors.After the drive amp stage, the signals are filtered by another Tx RF BPF(U306),and then sent to a PAM(PowerAmplifier Module , U307). Following this, the signals are sent to a duplexer(DP1) and an antenna ,and arefinally transmitted to base stations. The PAM mentioned above is based on GaAs technology, and was designedsuch that maximum output of over +23.0dBm(0.2W) could be achieved at the duplexer output terminal. ThePAM is driven by +5V. Also, a switching circuit is connected with the PAM for easy control of min & maxpower. The control signals for the switching circuit use TX_AGC_ADJ from the MSM.Also, a power detection circuit is included which detects and compensates for power increase due to temperature
LGP-2300/2310W LG Information & Communications, Ltd. - 20 -rise,and output error resulting from ripple variations. The signals from the PAM are then sent to the Tx inputterminal of the duplexer,receptacle,and finally transmitted through the antenna.The duplexer is essentially a dielectric filter that passes Tx and Rx signals along the respective paths,andsuppresses spurious signals. Its IL(insertion loss) within the Tx band is 3.6dB(Max).1.4 Description of Frequency Synthesizer Circuit1.4.1 Voltage Controlled Temperature Compensation Crystal Oscillator (U101,VCTCXO)VCTCXO is the reference frequency generator with frequency stability of ±2.0 ppm within the operationaltemperature range -30~+80 °C. The VCTCXO receives frequency tuning signals called TRK_LO_ADJ fromMSM as 0.5V~2.5V DC via R and C filters in order to generate the reference frequency of 19.68MHz and inputit to the frequency synthesizer of UHF band. The VCTCXO can achieve frequency deviation of up to±5.5ppm(216.48Hz) depending on the voltage.The supply voltage for the VCTCXO is 3V.1.4.2 UHF synthesizerThe UHF band frequency synthesizer is composed of an indirect frequency synthesizer(PLL,Phase LockedLoop,U102) ,a VCO (Voltage Controlled Oscillator,U151) with the center frequency of 1750MHz, a LoopFilter,and a directional coupler(U171). PLL IC’s phase detector compares the reference clock frequency divideddown to 10kHz by the reference divider with a signal from the VCO divided by the PLL’s main divider,thusgenerating local oscillation signals with zero phase difference. These local oscillation signals are used both forTx and Rx. The local oscillation signals are separated for Tx and Rx by the directional coupler,amplifiedrespectively,and fed into mixers.1.4.3 IF synthesizerThere are Rx and Tx IF synthesizers,respectively. The Tx IF synthesizer is composed of the IFT3000(U401),TxTank circuit,and the loop filter. The Tx phase detector within the IFT3000 receives the oscillation signals fromthe tank circuit,generating 130.38MHz Tx IF.The Rx IF synthesizer is composed of the PLL(Dual Mode PLL),the IFR3000,the Rx Tank circuit,and the loopfilter. The signal generated from the tank circuit is sent through the IFR3000 to the dual mode PLL’s phasedetector. The PLL IC generates control voltage to the loop filter such that 210.38MHz Rx IF is synthesized.
LGP-2300/2310W LG Information & Communications, Ltd. - 21 -2. Digital/Voice Processing Part2.1 OverviewThe digital/voice processing part processes the user's commands and processes all the digital and voice signalprocessing in order to operate in the phone. The digital/voice processing part is made up of a keypad/LCD,receptacle part, voice processing part, mobile station modem part, memory part, and power supply part.2.2 Configuration2.2.1 Keypad/LCD and Receptacle PartThis is used to transmit keypad signals to the MSM3000. It is made up of a keypad backlight part thatilluminates the keypad, LCD part that displays the operation status onto the screen, and a receptacle that receivesand sends out voice and data with external sources.2.2.2 Voice Processing PartThe voice processing part is made up of an audio codec(U701).The audio codec is used to convert MIC signalsinto digital voice signals and digital voice signals into analog voice signals.The audio codec also has anamplifying part for amplifying the voice signals and sending them to the ear piece, and an amplifying part thatamplifies signals coming out from MIC and transferring them to the audio processor,and an internal ring of tonegenerator.2.2.3 MSM (Mobile Station Modem) Part (U503)MSM is the core elements of CDMA terminal and carries out the functions of CPU, encoder, interleaver,deinterleaver, Viterbi decoder, Mod/Demod, and vocoder.2.2.4 Memory PartThe memory part is made up of a flash memory & SRAM(U1) for storing data, and an EEPROM(U501).2.2.5 Power Supply PartThe power supply part is made up of circuits for generating various types of power, used for the digital/voiceprocessing part. +3.6V from The battery is fed into a DC/DC converter(U602) and 6regulators(U603,U604,U605,U606, U607,U608).The DC/DC converter (U602) provides
LGP-2300/2310W LG Information & Communications, Ltd. - 22 -+5V.U603,U604,U606,U607,U608 produce +3.0V for the logic part,the RX circuitry,IFT&IFR3000,theCodec,and the UI part, respectively.The regulator U605 provides +3.6 U603, for the Tx circuitry.2.3 Circuit Description [Figure 2-1] Block Diagram of Digital/Voice Processing Part2.3.1 Keypad/LCD and Receptacle PartOnce the keypad is pressed, the key signals are sent out to the MSM3000 for processing. In addition, when thekey is pressed, the keypad lights up through the use of 8 LEDs. The terminal status and operation are displayedon the screen for the user with the characters and icons on the LCD(4 Line 512 Characters and 18 Icons [1Line])Moreover, it exchanges audio signals and data with external sources through the receptacle and then, receivespower from the battery or external batteries.2.3.2 Audio Processing PartMIC signals fed into the codec(U701). First, the signals are amplified through the mic preamp part and the micamp part of the codec.Then the signals are filtered, digitally converted and fed into the MSM3000. Also,thedigital audio signals outputted from the MSM3000 are converted into analog signals through the codec. First,thesignals are digital-to-analog converted by the PCM DAC part,bandpass filtered,and then amplified by theamplifier part.Also,the signals of the codec’s ringer, together with the MSM 3000’s ringer,activates the buzzerby activating Q703 and Q704.
LGP-2300/2310W LG Information & Communications, Ltd. - 23 -2.3.3 MSM PartThe MSM3000(U503) is the core element of CDMA system terminal. Subsystems within the MSM3000 includea CDMA processor, a QCELP(Qualcomm Code Excited Linear Predication) vocoder,an EVRC(EnhancedVariable Rate Codec) vocoder, an ARM microprocessor ,and assorted peripheral interfaces that are used tosupport other functions. The MSM3000,when operated in the CDMA mode, utilizes CHIPX8 (9.8304MHz)received from the IFR3000 as the reference clock primarily for CDMA and vocoder processing. The MSM3000also uses TCXO/4 (4.92MHz) received from U101.The CPU controls the terminal operation. Digital voice data that have been inputted are voice-encoded andvariable-rated. Then, they are convolutionally encoded so that error detection and correction are possible. Codedsymbols are interleaved in order to cope with multi-path fading. Each data channel is scrambled by the long codePN sequence of the user in order to ensure the confidentiality of calls.Moreover, binary quadrature codes are used based on Walsh functions in order to discern each channel. Datacreated thus are 4-phase modulated by one pair of Pilot PN code and they are used to create I and Q data.When received, I and Q data are demodulated into symbols by the demodulator and then, de-interleaved inreverse to the case of transmission. Then, the errors of data received from Viterbi decoder are detected andcorrected. They are voice decoded at the vocoder in order to output digital voice data.The MSM3000 also supports Enhanced Variable Rate Coder (EVRC) operation in addition to the standard 8kand 13k vocoding rating.2.3.4 Memory PartFlash Memory/SRAM U1 is a MCP (Multi Chip Package) that contents 16 Mbit flash memory and 2 Mbit StaticRAM. In the Flash Memory part of U1 (16Mbits), there are programs used for terminal operation. The programscan be changed through downloading after the assembling of terminals. On the SRAM(2Mbits) part, datagenerated during the terminal operation are stored temporarily. On the EEPROM U501,(128Kbits), non-volatiledata such as unique numbers (ESN) of terminals are stored.2.3.5 Power Supply PartWhen the battery voltage (3.6V) is fed in and the PWR key of keypad is pressed, ON_SW ‘H’ signal isgenerated. Then,ON_SW_S/ ‘L’ is generated from Q602,and thus the MSM recognizes that POWER key hasbeen pressed. During this time, MSM outputs PS_HOLD as 'H' ,and P_EN from D601 is turned ‘H’.This P_ENwill enable U603 which provides power to the MSM.DC-DC Converter U602 (SI9161) is operated by the control signal IDLE and RING_EN from the MSM3000.U602 generates +5V_VOUT. +5V_VOUT is mainly for the operation of the PAM and the ringer. The 3.0Vgenerated through the regulator U604 is for the operation of the RX part ,the PLL and the VCO is controlled by
LGP-2300/2310W LG Information & Communications, Ltd. - 24 -SLEEP/.The 3.6V generated by the regulator U605 is mainly for the TX part,and is controlled by IDLE/.The 3.0V generated by the regulator U606 provides voltage for the IFR3000 and the IFT3000,and is controlled byP_EN.The regulator U603 generates +3.0V for the EEPROM,the Flash Memory, and the MSM3000,and iscontrolled by P_EN.Regulator U607 generates +3.0V for the codec and is controlled by AUDIO_EN.U608generates +3.0V for the UI LED,and is controlled by P_EN.2.3.6 Logic PartThe Logic part consists of internal CPU of MSM, RAM, ROM and EEPROM. The MSM3000 receives TCXO/4(=4.92Mz) and CHIPX8 clock signals from the IFR3000 U402, and then controls the phone.The majorcomponents are as follows: CPU : ARM microprocessor FLASH MEMORY and SRAM : U1 (MB84VA2103-10) • FLASH ROM : 16Mbits • STATIC RAM : 2Mbits EEPROM : U501 (X84129_BGA) • 128Kbits EEPROMCPUThe MSM3000 uses an embedded ARM microprocessor,and this controls most of the functionality for themobile phone,including control of the external peripherals such as the keypad,LCD display,RAM,ROM andEEPROM devices. For the CPU clock, 27MHz is used.FLASH ROM and SRAMFlash ROM is used to store the terminal’s program. Using the down-loading program, the program can bechanged even after the terminal is fully assembled.SRAM is used to store the internal flag information, callprocessing data, and timer data.KEYPADFor key recognition, key matrix is setup using key sense 0-4 signals and GPIO0-5 of output ports of MSM.Eight LEDs and the backlight circuitry are included in the keypad for easy operation in the dark.LCD MODULELCD module contains a controller which will display the information onto the LCD by 8-bit data from theMSM. It also consists a DC-DC converter to supply +3.3V for fine view angle and LCD reflect to improve thedisplay efficiency.
LGP-2300/2310W LG Information & Communications, Ltd. - 25 -1. When power isn't "Turn On". 2. When LCD isn't displayed. CHAPTER 4. Trouble Shooting
LGP-2300/2310W LG Information & Communications, Ltd. - 26 -3. When Tx Audio (MIC) isn't transmitted.4. When Rx Audio (Speaker) isn't heard.
LGP-2300/2310W LG Information & Communications, Ltd. - 27 -5. When Keytone isn't heard.6. When Buzzer isn't rung.
LGP-2300/2310W LG Information & Communications, Ltd. - 28 -7. When Tx carrier isn't transmitted.
LGP-2300/2310W LG Information & Communications, Ltd. - 29 -
LGP-2300/2310W LG Information & Communications, Ltd. - 30 -
LGP-2300/2310W LG Information & Communications, Ltd. - 31 -8. When Rx sensitivity isn't normal.
LGP-2300/2310W LG Information & Communications, Ltd. - 32 - CHAPTER 5. Test Procedure
LGP-2300/2310W LG Information & Communications, Ltd. - 33 -1. Assembly and Disassembly Diagram2. Block & Circuit Diagram3. Part List4. Component Layout5. Accessories - Desktop Charger - Travel Charger - Cigar Lighter Charger - Hands Free Kit - Data Kit APPENDIX APPENDIX

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