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RF Section Troubleshooting (Millimeter-Wave Analyzers)
RF Section Description
2. RF input frequencies from 3.6 GHz to 17.1 GHz go through the high band
3. RF input frequencies from 17.1 GHz to 34.5 GHz go through the high band
4. RF input frequencies from 34.5 GHz to 50 GHz go through the high band
A9 Input Attenuator A
This assembly has two 2 dB attenuator sections, a 6 dB attenuator section, and
a cal signal input port.
176
path. Refer to the RF Highband Path #1 Block Diagram (Millimeter-Wave
Analyzers) in
Chapter 13
The input signal level can be optimized by Input Attenuator A and/or Input
Attenuator B. The Low Band Switch assembly routes the signal through
the A12 YTF Preselector. If one of the optional high band preamps is
licensed, the signal can be routed through the preamp. The A15 Front End
Controller provides switching signals.
The Low Band Switch assembly performs the following tasks:
— Provides a limiter that offers added protection for the mixer and
optional preamp.
— Contains the high band preamp.
— Routes the input signal to either the low band input of the A13 Front
End assembly or to the A12 YTF Preselector. If Options LNP or MPB
are installed, the signal is routed through switches.
The high band input switch in the Front End Assembly routes the RF input
signal to Mixer #2, where it mixes with the LO and provides a 1st
intermediate frequency of 322.5 MHz. The 322.5 MHz IF output is at
A13A1J7. The control voltages and biasing are provided by the A15 Front
End Control Assembly. The LO is doubled for tuned frequencies > 8.4 GHz
in this path.
path. Refer to the RF Highband Path #2 Block Diagram (Millimeter-Wave
Analyzers) in
Chapter 13
The signal path for 17.1 GHz to 34.5 GHz operation is almost the same as
the 3.6 GHz to 17.1 GHz path. The only difference is that Mixer #3 is used
in this path. The LO is doubled for all tuned frequencies in this path.
path. Refer to the RF Highband Path #3 Block Diagram (Millimeter-Wave
Analyzers) in
Chapter 13
The signal path for 34.5 GHz to 50 GHz operation is almost the same as
the 3.6 GHz to 17.1 GHz path. The only difference is that Mixer #4 is used
in this path. The LO is doubled for all tuned frequencies in this path.
for details.
for details.
for details.
N9030A PXA Signal Analyzer Service Guide
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Table of Contents
Troubleshooting
