Keysight N5244A/45A Service Guide 5-7
Theory of Operation
Synthesized Source Group Operation
Synthesized Source Group Operation
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
1
,
available online at:
http://literature.cdn.keysight.com/litweb/pdf/N5245-90008.pdf
and
http://literature.cdn.keysight.com/litweb/pdf/N5245-90016.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.”
For a simple block diagram of the
source group, refer to
In this section the following are described:
—
—
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)
—
(including rear-panel interconnects)
—
(including rear-panel interconnects)
Basic Operation
lists the L.O. harmonic number, the synthesizer
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.
Refer to
. 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 this LO signal with the test signal
output is a constant IF signal. For analyzers with DSP version 4.0, the IF signal
is 7.606 MHz (at frequencies below 53 MHz the IF is 2.535 MHz). For analyzers
with DSP version 5.0, the IF is 7.438 MHz (at frequencies below 53 MHz the IF
signal is 0.826 MHz). This IF signal is sent to the A16 SPAM board for digital
processing.
1. For PNA-X frequency ranges and maximum output power levels, refer to the section
“Test Port Output” in the
Data Sheet and Technical Specifications documents. See the
hyperlinks above.
Содержание PNA-X N5244A
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Страница 90: ...3 62 Keysight N5244A 45A Service Guide Tests and Adjustments Adjustments 3 ...
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Страница 155: ...Keysight N5244A 45A Service Guide 5 9 Theory of Operation Synthesized Source Group Operation Figure 5 3 Source Group ...
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