N9030B PXA Signal Analyzer Service Guide 179
RF Section Troubleshooting (Millimeter-Wave Analyzers)
RF Section Description
This assembly contains the following circuits:
— Input Low-pass filter (RF input signals < 3.6 GHz)
— Optional Low Band Electronic Attenuator (0-24 dB attenuation control)
— Optional Low Band Preamplifier and Limiter
— RF Mixer #1 (RF input signals < 3.6 GHz)
— 1st LO Sub-system (3.8 GHz to 8.7 GHz)
— 1st IF Amplifier (5122.5 MHz)
— Switched Filters (A13A2) provides wide BW band pass filter (low band)
— LO and IM nulling (A13A2)
— Mixer #2 (RF input signals 3.6 GHz to 17.1 GHz)
— Microwave Input Amplifier
— Mixer #3 (RF input signals 17 GHz to 34.5 GHz)
— Mixer #4 (RF input signals 34.4 GHz to 50 GHz)
—LO Doubler
— External Mixing Diplexer
A15 Front End Control Assembly
Provides the correct biasing and switch control logic to the following RF
assemblies:
— Input Attenuator A
— Input Attenuator B
—Low Band Switch
— (Option LNP) Low Noise Path
— YTF Preselector (Input signals > 3.6 GHz)
— (Option MPB) Microwave Preselector Bypass
— Front End Assembly including switched filter
— (Optional) High Band Preamplifier
—(Optional) Low Band Preamplifier
— (Option EA3) Electronic Attenuator (0-24 dB)
Refer to Chapter 6, “Front End Control Troubleshooting.” for detailed
descriptions & troubleshooting procedures
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