Name: Keysight N8973B
Brand: Keysight
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140 Keysight NFA Series Noise Figure Analyzers Service Guide

RF Section Troubleshooting (N8973B, 74B, 75B Analyzers)

RF Section Description

A13 RF Front End Assembly

This assembly is a self-contained microcircuit that is repaired at the assembly

level. See Figure 4-1.

Figure 4-1 A13 RF Front End Assembly View from Front Panel

This assembly contains the following circuits:

— Input Low-pass filter (RF input signals < 3.6 GHz)

—Low Band Limiter

— Optional Low Band Preamplifier

— RF Mixer #1 (RF input signals < 3.6 GHz)

— 1st L.O. Sub-system (3.8 GHz to 8.7 GHz)

— 1st I.F. Amplifier (5122.5 MHz)

— I.F. Band pass filter (5122.5 MHz)

— I.F. Low-pass filter (5122.5 MHz)

— Mixer #2 (RF input signals 3.6 GHz to 13.599 GHz)

— Microwave Input Amplifier

— Mixer #3 (RF input signals 13.6 GHz to 26.5 GHz)

— 2nd I.F. Amplifier (322.5 MHz)

— Microwave L.O. Sub-system (3.8 GHz to 8.7 GHz)

— L.O. Doubler

(Option EXM only)

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