5091 3661E A_87405A A 87405A

User Manual: A_87405A

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Agilent 87405A
Preamplifier 10 MHz to 3 GHz
Data Sheet

Discontinued Product Information
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Features
•
•
•
•

24 dB Gain
6.5 dB Noise Figure
Probe-Power Bias Connection
Compact Size

Benchtop/general purpose use
Used alone on the bench, the Agilent Technologies
87405A can be added to any application in which
additional gain and low noise are required. The
compact and inexpensive 11899A probe power
supply is a suitable source of DC bias in remote
applications.
The Agilent 87405A preamplifier brings reliable
gain and low noise figure to measurement systems
to improve overall system performance and reduce
systematic errors. With its compact size and convenient probe-power bias connection, the 87405A
is ideal for use as the front end preamplifier for a
variety of Agilent instruments such as the 8590E
series of portable spectrum analyzers. The 87405A
is the recommended preamplifier for use with the
8594E Noise Figure Measurement Solution. The
rugged design along with its insertable configuration of connectors makes the 87405A ideal for
test port applications.

Improve noise figure measurements

Increase sensitivity and speed

Add a preamplifier to noise figure measurement
systems to significantly lower system noise figure.
The noise figure of the system is dominated by the
noise figure of the preamplifier.

Adding preamplifiers to measurement systems can
improve sensitivity for measuring low-level signals.
Boost the sensitivity of your Agilent spectrum analyzer 15 to 25 dB by using the 87405A preamplifier.
Alternatively, better sensitivity can be traded for
measurement speed. Spurious tests often require
narrow resolution bandwidths to reduce the noise
floor of the analyzer, allowing low-level signal
detection. An analyzer with low noise figure allows
you to use a wider resolution bandwidth, yet
achieve the same sensitivity. Sweeptimes can
improve one hundred fold for each decade increase
in bandwidth. The 87405A preamplifier has gain
and noise figure characteristics that optimize
dynamic range and sensitivity.

Fnew = F pa + Fsys - 1
Gpa
Where F and G are noise figure and preamplifier
gain, both in linear terms.
NFsys = 10 log (Fsys) in dB
For systems having a single preamplifier, where
the gain of the preamplifier is greater than or
equal to the spectrum analyzer noise figure, the
system noise figure approximately equals the noise
figure of the preamplifier.
Gain (dB)

28

12
11

27

10

26

9

25

8

24

7

23

6
5

22

4

21
0.01

3
0.5

1

1.5
Frequency (GHz)

2

2.5

3

2

2.5

3

Noise Figure (dB)

10
9
8
7
6
5
4
3
2
1
0.01

2

Output Power (dBm) @ 1 dB compression (dB)

0.5

1

1.5
Frequency (GHz)

0.01

0.5

1

1.5
Frequency (GHz)

2

2.5

3

87405A product specifications

General specifications

Frequency Range

10-3000 MHz

Bias Voltage and Current

15 ±6% Vdc @ 80 mA
nominal

Small Signal Gain

22-27 dB min-max
Connectors

Gain Flatness

±1.25 dB 50-3000 MHz
±2.0 dB 10-3000 MHz

Type N(f) in, N(m) out
Probe Power Connector (f)

Output Power (1 dBC)

4 dBm

Noise Figure

6.5 dB 10-2000 MHz
7.5 dB 2000-3000 MHz

RF
DC

Weight

Third Order Intercept (TOI)

15 dBm typical

Harmonics
(@ +4 dBm output power)

20 dBc typical

Input VSWR

1.5:1 10-1000 MHz
1.7:1 1000-2000 MHz
2.0:1 2000-2900 MHz
2.2:1 2900-3000 MHz

Output VSWR

2.0:1

Impedance

50 ohms nominal

Reverse Isolation

60 dB typical

Survival Input Power (max)

+13 dBm typical

Power Dissipation

1.2 W nominal

Temperature

0 to +55°C
-40 to +70°C

(operating)
(storage)

net 270 g, shipping 510 g

Environmental information
EMC

IEC 801-2/1991 IEC 801-4/1988
IEC 801-3/1984 CISPR-11/1990

Moisture Resistance

65°C at 95% RH for 10 days per
Mil-Std-883C method 1004.5

Random Vibration

5.2 G (rms) to 2000 Hz per Mil-Std883C method 2026-11A

Shock

1500 G (peak), 0.5 ms per Mil-Std883C method 2002.3-B

Altitude, non-operating

15,000 meters per Mil-Std-883C
method 1001-C .

Specifications describe the instrument’s warranted performance over the temperature range 0°C to +55°C (unless otherwise noted). All specifications apply after
the instrument’s temperature has been stabilized after one hour continuous operation. Typical characteristics are intended to provide information useful in applying the instrument by giving typical but nonwarranted performance parameters.
These are denoted as “typical” or “nominal” and apply over the temperature
range 0°C to +55°C.
Caution: Electrostatic Discharge (ESD) can damage or destroy electronic components. It is recommended that this preamplifier, like other electronic components,
be installed and operated at a static-free workstation or in an environment where
precautions against ESD have been implemented.

3

Ordering information

www.agilent.com

87405A Preamplifier 10 MHz to 3 GHz
11899A Probe Power Supply
(must order one option)
Option 100
Option 120
Option 220
Option 240

100 V operation
120 V operation
220 V operation
240 V operation

Related literature

Pub. Number

8590E Series Technical Data Sheet

5091-3271E

11899A Technical Data Sheet

5091-0754E

Noise Figure Measurement Accuracy
Application Note 57-2

5952-3706

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28.0
57.3

28.0

124.9

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(fax) 800 829 4433
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(tel) 877 894 4414
(fax) 800 746 4866
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(fax) 800 820 2816
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Email: tm_ap@agilent.com
Contacts revised: 09/26/05

For more information on Agilent Technologies’ products, applications or services,
please contact your local Agilent office. The complete list is available at:

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Product specifications and descriptions in this document subject to change
without notice.
© Agilent Technologies, Inc. 1999, 2002, 2003, 2006
Printed in USA, July 11, 2006
5091-3661E



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