Keysight N5244A/45A Service Guide 5-13
Theory of Operation
Synthesized Source Group Operation
In bands 2-13, the fixed 3.4 GHz signal is mixed with 3.41 GHz to 3.90 GHz
signals from the 2–4 GHz oscillator to produce the output frequencies of 10
MHz to 500 MHz as listed in
.
In bands 14 and 15, the output of the swept VCO is passed through a
divide-by-4 circuit to produce the output frequencies listed in
.
In bands 16 and 17, the swept VCO signal is passed through a divide-by-2
circuit to produce the output frequencies listed in
.
In bands 18–20, the swept VCO signal is passed directly to the output of the
synthesizer board to produce the output frequencies listed in
.
In bands 21–44, the swept VCO signal is passed through a doubler circuit
where bands 21–23, 29–30, and 37 are sent directly to the output of the
synthesizer board while bands 24–28, 31–36 and 38–44 are passed through
another doubler circuit then to the output of the synthesizer board to produce
the output frequencies listed in
Refer to
. The output of the A15 13.5 GHz
synthesizer board (the LO synthesizer) is a frequency value higher than the
output of the A4 and A17 13.5 GHz synthesizer boards (the source
synthesizers). (For analyzers with DSP version 4.0, the frequency value is 7.606
MHz. For analyzers with DSP version 5.0, the frequency value is 7.438 MHz.)
This is because the output of the A15 13.5 GHz synthesizer board is routed
through the A25 LO multiplier/amplifier 26.5 board to the A27 and A28 mixer
bricks where they are mixed with the test signals to produce an IF signal for
each of eight receivers (A–D and R1–R4). Refer to
for a more complete description.
A5 and A10 26.5 GHz Source Boards
On 2-port models, the A10 26.5 GHz source board is optional and included
only with Option 224.
In bands 2–19, the A5 and A10 26.5 GHz source boards input signals from the
A4 or A17 13.5 GHz synthesizer board are passed through to both outputs
(main and secondary) unchanged.
For bands 20–28 and 32–36, the input signals are passed directly to the
secondary output or amplified and filtered, then sent to the main output.
For bands 29–31 and 37–44, the input signals are doubled, filtered, and
amplified. The signals for these bands are then either passed directly to the
secondary output or passed through more amplification and filtering and sent
to the main output.
A7, A8, A12, and A13 50 GHz Doubler Boards
On 2-port models, the A12 and A13 50 GHz doubler boards are optional and
included only with Option 224.
Содержание PNA-X N5244A
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Страница 90: ...3 62 Keysight N5244A 45A Service Guide Tests and Adjustments Adjustments 3 ...
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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 ...
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