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6
Theory of Operation
Introduction
his theory of operation begins with a general description of the operation of a network/tuner
analyzer system. his is followed by more detailed operating theory for the analyzer in
particular, divided into functional groups. he operation of each group is described brie
y, to
the assembly level only. Detailed component-level circuit theory is not provided here.
Simpli ed block diagrams illustrate the operation of each functional group. A more detailed
overall block diagram is provided at the end of the \ roubleshooting and Block Diagrams"
chapter.
System Theory
A network/tuner analyzer system consists of a source, signal separation devices, a receiver,
and a display. he analyzer integrates a synthesized RF source with built-in couplers for signal
separation, a combination narrowband and broadband receiver, and a display. Figure 6-1 shows
a simpli ed system block diagram for the analyzer.
In the analyzer, the A3 fractional-N/reference and A4 source assemblies provide the
synthesized RF source output. he A5 receiver assembly separates the signals into reference,
re
ected, and transmitted signals. hese inputs are processed as either narrowband or
broadband signals. hey are then multiplexed into ADCs (analog to digital converters) where
they are converted into digital signals. he digital data is processed by the A2 CPU assembly
and sent to the A7 display.
Insert artwork here.
Figure 6-1. Simpli ed Analyzer System Block Diagram
Theory of Operat on
6-1
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