Keysight N5244A/45A Service Guide 5-5
Theory of Operation
Network Analyzer System Operation
Synthesized Source Group
Refer to
. The built-in synthesized source
generates a swept, stepped, or continuous wave (CW) signal in the frequency
ranges as listed in the
Data Sheet and Technical Specifications documents
1
,
available online at:
http://literature.cdn.keysight.com/litweb/pdf/N5245-90008.pdf
and
http://literature.cdn.keysight.com/litweb/pdf/N5245-90016.pdf
. The source
group provides five signals: an LO signal and four incident signals. The LO
signal and the four incident signals are offset in frequency by the receiver IF.
For analyzers with DSP version 4.0, the receiver IF is 7.606 MHz (at tuned
frequencies below 53 MHz the IF and the offset is 2.535 MHz). For analyzers
with DSP version 5.0, the receiver IF is 7.438 MHz (at tuned frequencies below
53 MHz the IF and the offset is 0.826 MHz).
The LO signal is sent directly to the mixers in the receiver group. The incident
signals are routed to the front panel test ports and then to the device under
test (DUT) as the test signal. A portion of each incident signal is coupled off (in
the signal separation group) and sent to the mixers in the receiver group as
reference signals. These reference signals are compared (mixed) with the LO
signal in the receiver group. For analyzers with DSP version 4.0, the
comparison (mix) produces the 7.606 MHz (or 2.535 MHz at frequencies below
53 MHz) IF signal. For analyzers with DSP version 5.0, the comparison (mix)
produces the 7.438 MHz (or 0.826 MHz at frequencies below 53 MHz) IF signal.
The incident signal output power is leveled by an internal automatic leveling
control (ALC) circuit. The maximum output power level of the network analyzer
at the test ports is shown in the
Data Sheet and Technical Specifications
documents
, available online at:
http://literature.cdn.keysight.com/litweb/pdf/N5245-90008.pdf
and
http://literature.cdn.keysight.com/litweb/pdf/N5245-90016.pdf
Refer to
“Synthesized Source Group Operation” on page 5-7
Signal Separation Group
Each of the incident signals from the source group is separated into a reference
path and a test path. The reference signal is transmitted to the receiver group.
The test signal is transmitted through—and reflected from—the DUT and is then
transmitted to the receiver group.
The signal separation group includes:
— RF path switching to allow forward and reverse measurements
— external connections for the DUT (configurable test set)
— optional step attenuators in the source and receiver paths
— optional mechanical switches
1. For PNA-X frequency ranges and maximum output power levels, refer to the section
“Test Port Output” in the
Data Sheet and Technical Specifications documents. See the
hyperlinks above.
Содержание PNA-X N5244A
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Страница 90: ...3 62 Keysight N5244A 45A Service Guide Tests and Adjustments Adjustments 3 ...
Страница 146: ...4 56 Keysight N5244A 45A Service Guide Troubleshooting Instrument Block Diagrams Sheet 4 4 ...
Страница 155: ...Keysight N5244A 45A Service Guide 5 9 Theory of Operation Synthesized Source Group Operation Figure 5 3 Source Group ...
Страница 174: ...5 28 Keysight N5244A 45A Service Guide Theory of Operation Receiver Group Operation 5 Figure 5 6 4 Port Receiver Group ...
Страница 175: ...Keysight N5244A 45A Service Guide 5 29 Theory of Operation Receiver Group Operation Figure 5 7 2 Port Receiver Group ...
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