
8712ET/ES and 8714ET/ES Theory of Operation
RF Network Analyzers System Theory
Service Guide 6-3
System Theory
The 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
and Figure 6-2 show the simplified system block diagrams of the ET and ES analyzer
models.
In the analyzer, the fractional-N/reference (A3) and source (A4) assemblies provide the
synthesized RF source output. The receiver (A5) assembly separates the signals into
reference, reflected, and transmitted signals. These inputs are processed as either
narrowband or broadband signals. They are then multiplexed into ADCs (analog to digital
converters), where they are converted into digital signals. The digital data is processed by
the CPU (A2) assembly and sent to the A7 display.
The Analyzer Functional Groups
Each functional group consists of one or more assemblies that perform one of the basic
instrument functions. These groups are discussed in the following main sections:
• “Power Supply (A6)” on page 6-6
• “Digital Control Group” on page 6-6
• “Source Group” on page 6-8
• “Receiver Assembly (A5)” on page 6-12
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