190 Keysight CXG, EXG, and MXG X-Series Signal Generators Service Guide
RF Assembly
A3 RF Assembly Overview
There is one adjustment that is related to the Synthesizer Multiplier / Divider
section found in the performance verification and adjustment software for
these instruments, which will be covered later in this chapter.
RF Output Section
There are two different RF Output sections used in the five different A3 RF
assemblies. One is used by all RF instruments and one by all microwave
instruments.
There are four different input signals to the RF Output section. They are:
— RF signal from the Synthesizer Multiplier / Divider section output
— 1 GHz signal from the Reference Section to provide the LO for the Het Band
mixer
— Function Generator AM output to drive the Op-Amp Band
— Function Generator pulse output to drive the pulse modulator control
The RF signal level at the input of the RF Output section is a fixed level. For RF
instruments, the output level is either amplified or attenuated to achieve the
power level selected by the user. For microwave instruments, the RF Output
section is only used up to 3.2 GHz, and when attenuation is needed, the
attenuator is located on the A7 Micro-Deck assembly.
There are six main blocks in the RF Output section that will be discussed. They
are:
—Pulse Modulator
— High Band
—Low Band
—Het Band
— Op-Amp Band
— Output Attenuator
750 MHz to 1.5 GHz X 2 1.5 to 3 GHz
750 MHz to 1.5 GHz X 4 3 to 6 GHz
Table 10-1 Synthesizer Multiplier / Divider Ranges
Input Frequency Multiplier / Divisor Output Frequency
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