Agilent Technologies 8564EC Service Manual page 340

The linear amplifiers consist of two variable gain stages, U201C and
U201E as well as the buffer amplifier A4U201B, A4U201D, and
A4Q201. The linear amplifiers provide 0 to 40 dB of IF gain in 10 dB
steps. The gain of A4U201C can be increased by 20 dB by turning on
A4CR201 and A4CR210 with the control line LIN_20B. The gain of
A4U201E can be increased by either 10 dB or 20 dB with the control
lines LIN_10 or LIN_20A respectively. The gain can be selected by
setting the reference level of the 8564EC or 8565EC spectrum
analyzer.
Table 9-2 IF Gain Application Guidelines (ATTEN=10 dB)
Power into
A4J3
+6 dBm
−4 dBm
−14dBm
−24 dBm
−34 dBm
Chapter 9
Reference Gain of
Level A4U201C
(Pin 8 in;
Pin 3 out)
−50 dBm
0 dB
−60 dBm
0 dB
−70 dBm
0 dB
−80 dBm
20 dB
−90 dBm
20 dB
Log Amplifier (P/O A4 Assembly)
Gain of Total Gain
A4U201E
(Pin 3 in;
Pin 10 out)
0 dB 0 dB
10 dB 10 dB
20 dB 20 dB
10 dB 30 dB
20 dB 40 dB
IF Section
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