AN 31 Op Amp Circuit Collection (Rev. B) 140 B Snla140b

User Manual: 140 B

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Application Report
SNLA140B–May 2004–Revised May 2013
AN-31 Op Amp Circuit Collection
.....................................................................................................................................................
ABSTRACT
This application report provides basic circuits of the Texas Instruments op amp collection.
Contents
1 Introduction .................................................................................................................. 4
2 Basic Circuits ................................................................................................................ 4
3 Signal Generation ......................................................................................................... 15
4 Signal Processing ......................................................................................................... 25
List of Figures
1 Inverting Amplifier........................................................................................................... 4
2 Non-Inverting Amplifier ..................................................................................................... 4
3 Difference Amplifier......................................................................................................... 4
4 Inverting Summing Amplifier............................................................................................... 5
5 Non-Inverting Summing Amplifier......................................................................................... 5
6 Inverting Amplifier with High Input Impedance.......................................................................... 5
7 Fast Inverting Amplifier with High Input Impedance.................................................................... 6
8 Non-Inverting AC Amplifier ................................................................................................ 6
9 Practical Differentiator...................................................................................................... 7
10 Integrator..................................................................................................................... 7
11 Fast Integrator............................................................................................................... 8
12 Current to Voltage Converter.............................................................................................. 8
13 Circuit for Operating the LM101 Without a Negative Supply.......................................................... 9
14 Circuit for Generating the Second Positive Voltage .................................................................... 9
15 Neutralizing Input Capacitance to Optimize Response Time ......................................................... 9
16 Integrator with Bias Current Compensation............................................................................ 10
17 Voltage Comparator for Driving DTL or TTL Integrated Circuits .................................................... 10
18 Threshold Detector for Photodiodes .................................................................................... 11
19 Double-Ended Limit Detector ............................................................................................ 11
20 Multiple Aperture Window Discriminator................................................................................ 12
21 Offset Voltage Adjustment for Inverting Amplifiers Using Any Type of Feedback Element ..................... 13
22 Offset Voltage Adjustment for Non-Inverting Amplifiers Using Any Type of Feedback Element ............... 13
23 Offset Voltage Adjustment for Voltage Followers ..................................................................... 13
24 Offset Voltage Adjustment for Differential Amplifiers ................................................................. 14
25 Offset Voltage Adjustment for Inverting Amplifiers Using 10 kΩSource Resistance or Less................... 14
26 Low Frequency Sine Wave Generator with Quadrature Output..................................................... 15
27 High Frequency Sine Wave Generator with Quadrature Output .................................................... 16
28 Free-Running Multivibrator ............................................................................................... 16
29 Wein Bridge Sine Wave Oscillator ...................................................................................... 17
30 Function Generator........................................................................................................ 17
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31 Pulse Width Modulator.................................................................................................... 18
32 Bilateral Current Source .................................................................................................. 18
33 Bilateral Current Source .................................................................................................. 19
34 Wein Bridge Oscillator with FET Amplitude Stabilization ............................................................ 20
35 Low Power Supply for Integrated Circuit Testing ..................................................................... 21
36 Positive Voltage Reference .............................................................................................. 22
37 Positive Voltage Reference .............................................................................................. 22
38 Negative Voltage Reference ............................................................................................. 23
39 Negative Voltage Reference ............................................................................................. 23
40 Precision Current Sink .................................................................................................... 24
41 Precision Current Source................................................................................................. 24
42 Differential-Input Instrumentation Amplifier ............................................................................ 25
43 Variable Gain, Differential-Input Instrumentation Amplifier .......................................................... 26
44 Instrumentation Amplifier with ±100 Volt Common Mode Range ................................................... 27
45 Instrumentation Amplifier with ±10 Volt Common Mode Range..................................................... 28
46 High Input Impedance Instrumentation Amplifier...................................................................... 29
47 Bridge Amplifier with Low Noise Compensation....................................................................... 29
48 Bridge Amplifier............................................................................................................ 30
49 Precision Diode ............................................................................................................ 30
50 Precision Clamp ........................................................................................................... 31
51 Fast Half Wave Rectifier.................................................................................................. 31
52 Precision AC to DC Converter........................................................................................... 32
53 Low Drift Peak Detector .................................................................................................. 32
54 Absolute Value Amplifier with Polarity Detector ....................................................................... 33
55 Sample and Hold .......................................................................................................... 34
56 Sample and Hold .......................................................................................................... 34
57 Low Drift Integrator........................................................................................................ 35
58 Fast†Summing Amplifier with Low Input Current ..................................................................... 36
59 Fast Integrator with Low Input Current ................................................................................. 37
60 Adjustable Q Notch Filter................................................................................................. 38
61 Easily Tuned Notch Filter................................................................................................. 39
62 Tuned Circuit............................................................................................................... 39
63 Two-Stage Tuned Circuit ................................................................................................. 40
64 Negative Capacitance Multiplier......................................................................................... 40
65 Variable Capacitance Multiplier.......................................................................................... 41
66 Simulated Inductor ........................................................................................................ 41
67 Capacitance Multiplier .................................................................................................... 42
68 High Pass Active Filter.................................................................................................... 42
69 Low Pass Active Filter .................................................................................................... 43
70 Nonlinear Operational Amplifier with Temperature Compensated Breakpoints................................... 43
71 Current Monitor ............................................................................................................ 44
72 Saturating Servo Preamplifier with Rate Feedback................................................................... 44
73 Power Booster ............................................................................................................. 45
74 Analog Multiplier ........................................................................................................... 45
75 Long Interval Timer........................................................................................................ 46
76 Fast Zero Crossing Detector............................................................................................. 46
77 Amplifier for Piezoelectric Transducer .................................................................................. 47
78 Temperature Probe........................................................................................................ 47
79 Photodiode Amplifier ...................................................................................................... 48
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80 Photodiode Amplifier ...................................................................................................... 48
81 High Input Impedance AC Follower..................................................................................... 48
82 Temperature Compensated Logarithmic Converter................................................................... 49
83 Root Extractor.............................................................................................................. 49
84 Multiplier/Divider ........................................................................................................... 50
85 Cube Generator............................................................................................................ 50
86 Fast Log Generator ....................................................................................................... 51
87 Anti-Log Generator ........................................................................................................ 51
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Introduction
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1 Introduction
Texas Instruments recommends replacing 2N2920 and 2N3728 matched pairs with LM394 in all
application circuits.
2 Basic Circuits
Figure 1. Inverting Amplifier
Figure 2. Non-Inverting Amplifier
For minimum offset error due to input bias current.
Figure 3. Difference Amplifier
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Basic Circuits
R5 = R1//R2//R3//R4
For minimum offset error due to input bias current/
Figure 4. Inverting Summing Amplifier
* RS= 1k for 1% accuracy
Figure 5. Non-Inverting Summing Amplifier
* Source Impedance less than 100k gives less than 1% gain error.
Figure 6. Inverting Amplifier with High Input Impedance
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Basic Circuits
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Figure 7. Fast Inverting Amplifier with High Input Impedance
Figure 8. Non-Inverting AC Amplifier
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Basic Circuits
Figure 9. Practical Differentiator
For minimum offset error due to input bias current.
Figure 10. Integrator
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Basic Circuits
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Figure 11. Fast Integrator
VOUT = lIN R1
*For minimum error due to bias current R2 = R1
Figure 12. Current to Voltage Converter
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Basic Circuits
Figure 13. Circuit for Operating the LM101 Without a Negative Supply
Figure 14. Circuit for Generating the Second Positive Voltage
Figure 15. Neutralizing Input Capacitance to Optimize Response Time
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Basic Circuits
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* Adjust for zero integrator drift.
Current drift typically 0.1 n/A°C over −55°C to 125°C temperature range.
Figure 16. Integrator with Bias Current Compensation
Figure 17. Voltage Comparator for Driving DTL or TTL Integrated Circuits
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Basic Circuits
Figure 18. Threshold Detector for Photodiodes
VOUT = 4.6V for VLT ≤VIN ≤VUT
VOUT = 0V for VIN < VLT or VIN > VUT
Figure 19. Double-Ended Limit Detector
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Basic Circuits
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Figure 20. Multiple Aperture Window Discriminator
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Basic Circuits
Figure 21. Offset Voltage Adjustment for Inverting Amplifiers Using Any Type of Feedback Element
Figure 22. Offset Voltage Adjustment for Non-Inverting Amplifiers Using Any Type of Feedback Element
Figure 23. Offset Voltage Adjustment for Voltage Followers
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Basic Circuits
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Figure 24. Offset Voltage Adjustment for Differential Amplifiers
Figure 25. Offset Voltage Adjustment for Inverting Amplifiers Using 10 kΩSource Resistance or Less
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Signal Generation
3 Signal Generation
Figure 26. Low Frequency Sine Wave Generator with Quadrature Output
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Signal Generation
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Figure 27. High Frequency Sine Wave Generator with Quadrature Output
* Chosen for oscillation at 100 Hz
Figure 28. Free-Running Multivibrator
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Signal Generation
* Eldema 1869 10V, 14 mA Bulb
Figure 29. Wein Bridge Sine Wave Oscillator
Figure 30. Function Generator
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Signal Generation
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Figure 31. Pulse Width Modulator
Figure 32. Bilateral Current Source
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Signal Generation
Figure 33. Bilateral Current Source
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Signal Generation
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Figure 34. Wein Bridge Oscillator with FET Amplitude Stabilization
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Signal Generation
* VOUT = 1V/kΩ
Figure 35. Low Power Supply for Integrated Circuit Testing
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Signal Generation
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Figure 36. Positive Voltage Reference
Figure 37. Positive Voltage Reference
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Signal Generation
Figure 38. Negative Voltage Reference
Figure 39. Negative Voltage Reference
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Signal Generation
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Figure 40. Precision Current Sink
Figure 41. Precision Current Source
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Signal Processing
4 Signal Processing
Figure 42. Differential-Input Instrumentation Amplifier
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Signal Processing
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* Gain adjust AV= 10−4R6
Figure 43. Variable Gain, Differential-Input Instrumentation Amplifier
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Signal Processing
† Matching determines common mode rejection.
Figure 44. Instrumentation Amplifier with ±100 Volt Common Mode Range
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Figure 45. Instrumentation Amplifier with ±10 Volt Common Mode Range
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Signal Processing
*† Matching Determines CMRR
‡ May be deleted to maximize bandwidth
Figure 46. High Input Impedance Instrumentation Amplifier
* Reduces feed through of power supply noise by 20 dB and makes supply bypassing unnecessary.
† Trim for best common mode rejection
‡ Gain adjust
Figure 47. Bridge Amplifier with Low Noise Compensation
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Signal Processing
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Figure 48. Bridge Amplifier
Figure 49. Precision Diode
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Signal Processing
* EREF must have a source impedance of less than 200Ωif D2 is used.
Figure 50. Precision Clamp
Figure 51. Fast Half Wave Rectifier
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Signal Processing
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* Feedforward compensation can be used to make a fast full wave rectifier without a filter.
Figure 52. Precision AC to DC Converter
Figure 53. Low Drift Peak Detector
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Signal Processing
Figure 54. Absolute Value Amplifier with Polarity Detector
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Signal Processing
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* Polycarbonate-dielectric capacitor
Figure 55. Sample and Hold
* Worst case drift less than 2.5 mV/sec
† Teflon, Polyethylene or Polycarbonate Dielectric Capacitor
Figure 56. Sample and Hold
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Signal Processing
* Q1 and Q3 should not have internal gate-protection diodes.
Worst case drift less than 500 μV/sec over −55°C to +125°C.
Figure 57. Low Drift Integrator
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Signal Processing
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* In addition to increasing speed, the LM101A raises high and low frequency gain, increases output drive capability
and eliminates thermal feedback.
† Power Bandwidth: 250 kHz
Small Signal Bandwidth: 3.5 MHz
Slew Rate: 10V/μs
Figure 58. Fast†Summing Amplifier with Low Input Current
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Signal Processing
Figure 59. Fast Integrator with Low Input Current
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Signal Processing
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Figure 60. Adjustable Q Notch Filter
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Signal Processing
Figure 61. Easily Tuned Notch Filter
Figure 62. Tuned Circuit
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Signal Processing
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Figure 63. Two-Stage Tuned Circuit
Figure 64. Negative Capacitance Multiplier
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Signal Processing
Figure 65. Variable Capacitance Multiplier
L≥R1 R2 C1
RS= R2
RP= R1
Figure 66. Simulated Inductor
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Signal Processing
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Figure 67. Capacitance Multiplier
* Values are for 100 Hz cutoff. Use metalized polycarbonate capacitors for good temperature stability.
Figure 68. High Pass Active Filter
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Signal Processing
* Values are for 10 kHz cutoff. Use silvered mica capacitors for good temperature stability.
Figure 69. Low Pass Active Filter
Figure 70. Nonlinear Operational Amplifier with Temperature Compensated Breakpoints
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Signal Processing
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Figure 71. Current Monitor
Figure 72. Saturating Servo Preamplifier with Rate Feedback
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Signal Processing
Figure 73. Power Booster
Figure 74. Analog Multiplier
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Signal Processing
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* Low leakage −0.017 μF per second delay
Figure 75. Long Interval Timer
Propagation delay approximately 200 ns
† DTL or TTL fanout of three.
Minimize stray capacitance
Pin 8
Figure 76. Fast Zero Crossing Detector
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Signal Processing
Low frequency cutoff = R1 C1
Figure 77. Amplifier for Piezoelectric Transducer
* Set for 0V at 0°C
† Adjust for 100 mV/°C
Figure 78. Temperature Probe
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Signal Processing
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VOUT = R1 ID
Figure 79. Photodiode Amplifier
VOUT = 10 V/μA
*Operating photodiode with less than 3 mV across it eliminates leakage currents.
Figure 80. Photodiode Amplifier
Figure 81. High Input Impedance AC Follower
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Signal Processing
10 nA < IIN < 1 mA
Sensitivity is 1V per decade
† 1 kΩ(±1%) at 25°C, +3500 ppm/°C.
Available from Vishay Ultronix, Grand Junction, CO, Q81 Series.
* Determines current for zero crossing on output: 10 μA as shown.
Figure 82. Temperature Compensated Logarithmic Converter
*† 2N3728 matched pairs
Figure 83. Root Extractor
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Figure 84. Multiplier/Divider
Figure 85. Cube Generator
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Signal Processing
† 1 kΩ(±1%) at 25°C, +3500 ppm/°C.
Available from Vishay Ultronix, Grand Junction, CO, Q81 Series.
Figure 86. Fast Log Generator
† 1 kΩ(±1%) at 25°C, +3500 ppm/°C.
Available from Vishay Ultronix, Grand Junction, CO, Q81 Series.
Figure 87. Anti-Log Generator
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