Keysight N5247B Service Guide 5-25
Theory of Operation
Synthesized Source Group Operation
A4, A15, and A17 13.5 GHz Synthesizer Boards (S/N Prefixes
<
6021
Only)
On 2-ports models, the A17 13.5 GHz synthesizer board is optional and
included only with Option 224.
The A4, A15, and A17 13.5 GHz synthesizer boards use the 50 MHz reference
signal from the A14 frequency reference board to tune two VCO circuits: one
that sweeps from 2 GHz to 4 GHz and one that is set to a fixed CW frequency of
3.4 GHz.
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 a 7.606 MHz IF
signal for each of eight receivers (A–D and R1–R4). Refer to
for a more complete description.
Summary of Contents for N5247B
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Page 268: ...6 30 Keysight N5247B Service Guide Replaceable Parts Replaceable Parts Listings 6 ...
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