Atec Agilent-87405A User Manual

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
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