Keysight Technologies N5244/5B Service Manual page 175

Theory of Operations
Network Analyzer System Operation
Synthesized Source Group
Refer to
Version 6 Synthesizers and below:
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,
https://www.keysight.com/upload/cmc_upload/All/N5244B-45B_Synth6.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).
Version 7 Synthesizers:
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",
https://www.keysight.com/us/en/assets/9018-04523/data-sheets/9018-04
523.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 DDS assemblies, the receiver IF is 7.438 MHz
(at tuned frequencies below 53 MHz the IF and the offset is 0.826 MHz).
LO Behavior without LFE (Low Frequency Extension):
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.
1. Version 6 synthesizers and below: For PNA-X frequency ranges and maximum out-
2. Version 7 synthesizers: For PNA frequency ranges and maximum output power lev-
Keysight N5244B/45B Service Guide
the Note notice on page
(N5245-90028).
put power levels, refer to the section "Test Port Output" in the Data Sheet and
Technical Specifications documents. See the hyperlinks above.
els, refer to the section "Test Port Output" in the online Keysight document,
"N5244/5B– (900 Hz) 10 MHz to 50 GHz Data Sheet and Technical Specifica-
tions." See the hyperlink above.
5-1.
1
available online at:
2
available online at:
5-7