Synthesized Source Group Operation; Basic Operation - Keysight Technologies N5224/5A Service Manual

Theory of Operation

Synthesized Source Group Operation

Synthesized Source Group Operation
Refer to
The source group produces a stable output signal by phase locking a
synthesized voltage-controlled oscillator (VCO). For the full frequency range of
the source, refer to the Data Sheet and Technical Specifications documents,
available online at:
https://www.keysight.com/us/en/assets/9018-04042/technical-specificatio
ns/9018-04042.pdf
https://www.keysight.com/us/en/assets/9018-04125/technical-specificatio
ns/9018-04125.pdf
The outputs at the front panel test ports are swept, stepped or CW signals.
Maximum leveled output powers are also listed in the Data Sheet and
Technical Specifications documents.
source group, refer to
In this section the following are described:
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Basic Operation

Table 5-3 on page 5-10
frequencies (A4, A15, and A17), the main source frequency (A5 and A10), and
the doubler frequencies (A7, A8, A12, and A13) within the analyzer for each
band. This table is referred to throughout this chapter and also appears on the
overall block diagram at the end of
The A14 frequency reference board produces a constant phase locked
reference signal of 50 MHz that is sent to the A4, A15, and A17 13.5 GHz
synthesizer boards.
The A15 13.5 GHz synthesizer board produces an LO signal that is sent through
the A25 LO multiplier/amplifier 26.5 board to the A27 and A28 mixer bricks (via
the A26 splitter). The frequency is synthesized such that the mixing product of
Keysight N5224A/25A Service Guide
the Note notice on page
(N5224-90001) and
(N5224-90002)
Figure 5-3 on page
Basic Operation
A4, A15, and A17 13.5 GHz Synthesizer Boards
A5 and A10 26.5 GHz Source Boards
A7, A8, A12, and A13 50 GHz Doubler Boards
A25 Multiplier/Amplifier 26.5 Board (HMA26.5)
A14 Frequency Reference Board
A23 Test Set Motherboard
lists the L.O. harmonic number, the synthesizer
1. For frequency ranges and maximum output power levels, refer to the section "Test
Port Output" in the Data Sheet and Technical Specifications documents (see
hyperlinks above).
5-1.
1
1 For a simple block diagram of the
5-9.
(including rear-panel interconnects)
(including rear-panel interconnects)
Chapter 4, "Troubleshooting."
5-7