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6
Theory
of
Operation
Introduction
This
theory
of
operation
begins
with
a
general
description
of
the
operation
of
a
network
analyzer
system.
This
is
followed
by
more
detailed
operating
theory
for
the
analyzer
in
particular
,
divided
into
functional
groups
.
The
operation
of
each
group
is
described
briey
,
to
the
assembly
level
only
.
Detailed
component-level
circuit
theory
is
not
provided
here
.
Simplied
block
diagrams
illustrate
the
operation
of
each
functional
group
.
A
more
detailed
overall
block
diagram
is
provided
at
the
end
of
the
\Troubleshooting
and
Block
Diagrams"
chapter
.
System
Theory
A
network
analyzer
system
consists
of
a
source
,
signal
separation
devices
,
a
receiver
,
and
a
display
.
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
shows
a
simplied
system
block
diagram
for
the
analyzer
.
In
the
analyzer
,
the
A3
fractional-N/reference
and
A4
source
assemblies
provide
the
synthesized
RF
source
output.
The
A5
receiver
assembly
separates
the
signals
into
reference
,
reected,
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
A2
CPU
assembly
and
sent
to
the
A7
display
.
Figure
6-1.
Simplied
Analyzer
System
Block
Diagram
Theory
of
Operation
6-1
Summary of Contents for 87114B
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