A5 And A10 26.5 Ghz Source Boards; A7, A8, A12, And A13 50 Ghz Doubler Boards - Keysight Technologies N5244/5B Service Manual

Theory of Operations
Synthesized Source Group Operation

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.
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
Keysight N5244B/45B Service Guide
Table 5-6.
"A27 and A28 Mixer Bricks" on page 5-51.
5-25