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.
Agilent 87405A
Preamplifier 10 MHz to 3 GHz
Data Sheet
2
Improve noise figure measurements
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.
F
new
= F pa + F
sys
- 1
G
pa
Where F and G are noise figure and preamplifier
gain, both in linear terms.
NF
sys
= 10 log (F
sys
) 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.
Increase sensitivity and speed
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.
Gain (dB)
28
27
26
25
24
23
22
21
0.01
0.5 1
1.5
2 2.5 3
Frequency (GHz)
Noise Figure (dB)
10
9
8
7
6
5
4
3
0.01
0.5 1
1.5
2 2.5 3
Frequency (GHz)
2
1
Output Power (dBm) @ 1 dB compression (dB)
12
11
10
9
8
7
6
5
0.01
0.5 1
1.5
2 2.5 3
Frequency (GHz)
4
3
3
87405A product specifications
Frequency Range 10-3000 MHz
Small Signal Gain 22-27 dB min-max
Gain Flatness ±1.25 dB 50-3000 MHz
±2.0 dB 10-3000 MHz
Output Power (1 dBC) 4 dBm
Noise Figure 6.5 dB 10-2000 MHz
7.5 dB 2000-3000 MHz
Third Order Intercept (TOI) 15 dBm typical
Harmonics 20 dBc typical
(@ +4 dBm output power)
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 (operating) 0 to +55°C
(storage) -40 to +70°C
Specifications describe the instrument’s warranted performance over the tempera-
ture 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 compo-
nents. 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.
General specifications
Bias Voltage and Current 15 ±6% Vdc @ 80 mA
nominal
Connectors RF Type N(f) in, N(m) out
DC Probe Power Connector (f)
Weight 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-Std-
883C method 2026-11A
Shock 1500 G (peak), 0.5 ms per Mil-Std-
883C method 2002.3-B
Altitude, non-operating 15,000 meters per Mil-Std-883C
method 1001-C .
Ordering information
87405A Preamplifier 10 MHz to 3 GHz
11899A Probe Power Supply
(must order one option)
Option 100 100 V operation
Option 120 120 V operation
Option 220 220 V operation
Option 240 240 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
57.3
124.9
28.0
28.0
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Product specifications and descriptions in this
document subject to change without notice.
© Agilent Technologies, Inc. 1999, 2002, 2003
Printed in USA, February 3, 2003
5091-3661E
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