A7, A8, A12, And A13 50 Ghz Doubler Boards; A25 Multiplier/Amplifier 26.5 Board (Hma26.5) - Keysight N5224B Series Service Manual

Theory of Operation
Synthesized Source Group Operation

A7, A8, A12, and A13 50 GHz Doubler Boards

The A12 and A13 50 GHz doubler boards are included only on 4-port models.
Refer to
here.
For bands 2–15, 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 16–30, 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 16–18, the input signals of all four doubler boards are amplified and
filtered, then sent to the doubler board output.
For bands 19–30, the input signals of all four doubler boards are doubled,
amplified and filtered, then sent to the doubler board output.
Doubler board output signals for bands 2–30 create the full synthesized source
output frequency range of 10 MHz to 50 GHz.
The A7 50 GHz doubler board provides an EXT TSET DRIVE RF1 OUT signal to
the rear panel. This signal is output 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

A25 Multiplier/Amplifier 26.5 Board (HMA26.5)

Refer to
here.
In bands 2–15 and 23-25, the synthesized LO input is filtered, amplified, and
passed through to the A26 splitter (
splitter (
doubled, and filtered, then sent to the output.
1. A26 splitter only applies to PNA models with serial number prefix <6021.
5-22
Table 5-6 and Figure 5-6
"A27 and A28 Mixer Bricks" on page
Table 5-6 and Figure 5-6
4-port only) In bands 16–22 and 26-30, the input is amplified,
≥6021,
for band numbers and frequencies discussed
5-47.
for band numbers and frequencies discussed
6021 S/N prefixes, 4-port) or internal
<
1
Keysight N5224B/25B Service Guide