Keysight Technologies N5247B, Service Manual

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Keysight N5247B Service Guide 5-27
Theory of Operation
Synthesized Source Group Operation
Rear-Panel Interconnects
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 40 GHz Doubler Boards
On 2-port models, the A12 and A13 40 GHz doubler boards are optional and
included only with Option 224.
For bands 2–28, the lowband input ports of the A7, A8, A12, and A13 40 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 29–48, the highband input ports of the A7 and A12 40 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 29–38, the input signals of all four doubler boards are doubled,
amplified and filtered, then sent to the doubler board output P6, creating the
full synthesized source output frequency range of 10 MHz to 40 GHz.
SRC3 J13 SMA connector, enables the 3rd source output. (Requires Option XSB, 422/423
with and without Option 029 only).
REF INPUT (s/n prefixes ≥ 6021
only)
A BNC connector that allows an external frequency reference signal to be used to
phase lock the analyzer for increased frequency accuracy.
The analyzer automatically enables the external frequency reference feature when
a signal is connected to this input. When the signal is removed, the analyzer
automatically switches back to its internal frequency reference.
REF OUTPUT (s/n prefixes ≥ 6021
only)
A BNC connector that allows a reference signal, produced by the A15 direct
digital synthesizer (DDS) assembly, to be output for use in phase locking external
test equipment.