176 N9030B PXA Signal Analyzer Service Guide
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
path. Refer to the RF Highband Path #1 Block Diagram (Millimeter-Wave
Analyzers) in
for details.
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.
3. RF input frequencies from 17.1 GHz to 34.5 GHz
go through the high band
path. Refer to the RF Highband Path #2 Block Diagram (Millimeter-Wave
Analyzers) in
for details.
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.
4. RF input frequencies from 34.5 GHz to 50 GHz
go through the high band
path. Refer to the RF Highband Path #3 Block Diagram (Millimeter-Wave
Analyzers) in
for details.
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.
A9 Input Attenuator A
This assembly has two 2 dB attenuator sections, a 6 dB attenuator section, and
a cal signal input port.
Summary of Contents for N9030B
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Page 342: ...342 N9030B PXA Signal Analyzer Service Guide Hardware Options Option RTS Streaming ...
Page 344: ...344 N9030B PXA Signal Analyzer Service Guide Block Diagrams Block Diagrams Block Diagrams ...
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