5-14 Keysight N5244A/45A Service Guide
Theory of Operation
Synthesized Source Group Operation
5-
For bands 2–28, the lowband input ports of the A7, A8, A12, and A13 50 GHz
doubler boards receive their signals from the A5 and A10 source module OUT 1
and OUT 2 outputs. These signals are passed through to the doubler board
output unchanged.
For bands 29–44, the highband input ports of the A7 and A12 50 GHz doubler
boards receive their signals from the A5 and A10 source module P4 outputs.
These signals are amplified by the A7 and A12 doubler boards and output via
the highband output ports to the highband input ports on the A8 and A13
doubler boards.
For bands 29–31, the input signals of all four double boards are amplified and
filtered, then sent to the doubler board output.
For bands 32–44, the input signals of all four double boards are doubled,
amplified and filtered, then sent to the doubler board output.
Doubler board output signals for bands 2–44 create the full synthesized source
output frequency range of 10 MHz to 50 GHz. The output frequencies for each
band are listed in
The A7 50 GHz doubler board provides an EXT TSET DRIVE RF OUT signal to
the rear panel. This signal is output in bands 20–31 at a frequency range of
3.2–19 GHz for use with an external test set. This output is terminated with a
50-ohm load on the A8, A12, and A13 doubler boards.
The companion signal, EXT TEST SET DRIVE LO, is output from the A27 mixer
brick. Refer to
“A27 and A28 Mixer Bricks” on page 5-25
.
A25 Multiplier/Amplifier 26.5 Board (HMA26.5)
In bands 2–28 and 36–39, the synthesized LO input is filtered, amplified, and
passed through to the A26 splitter (4-port only). In bands 29–35 and 40–44 ,
the input is amplified, doubled, and filtered, then sent to the output.
Together, these signal paths create the full output frequency range of 12.5
MHz to 26.508 GHz that is sent to the A26 splitter (4-port only) where the
signal is divided and sent to the A27 and A28 (4-port only) mixer bricks as the
LO signal.
A14 Frequency Reference Board
This assembly provides stable reference frequencies to the rest of the
instrument. A high stability 10 MHz oven-controlled crystal oscillator (OCXO)
normally provides the frequency standard. However, if a 10 MHz external
reference signal is detected at the 10 MHz EXT REF IN port on the rear panel, it
is used as the frequency reference instead.
The 10 MHz reference signal is used to phase lock a 100 MHz VCO. The output
of this VCO is then divided by ten to produce the 10 MHz EXT REF OUT rear
panel signal and also a 10 MHz reference signal for the A16 signal processing
Содержание PNA-X N5244A
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