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Measuring Electrical Length and Phase Distortion
Electrical Length
The analyzer mathematically implements a function similar to the mechanical “line stretchers”
of earlier analyzers. This feature simulates a variable length
lossless
transmission line, which
you can add to or remove from the analyzer’s receiver input to compensate for interconnecting
cables,
etc.
In this example, the electronic line stretcher measures the electrical length of a
SAW filter.
Phase Distortion
The analyzer allows you to measure the linearity of the phase shift through a device over a
range of frequencies and the analyzer can express it in two different ways:
n
deviation from linear phase
n
group delay
Measuring Electrical Length
1. Connect your test device as shown in Figure 2-33.
NETWORK ANALYZER
DEVICE UNDER TEST
Figure
2-33. Device
Cmmections
for Measuring Electrical Length
2. Press
w
and choose the measurement settings For this example, the measurement
settings include reducing the frequency span to eliminate under sampled phase response.
Press the following keys as shown:
/:...;
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
J,;
..,.,.,.. ,...,.,.,.,.,.,.,.,.........;
,.,./
%
. . . . . . . . . . . . . .
_
::,:.::.,..
IMeas]
~~~~~~:,~~~~~~~~~
.: / :.
7;;
. . . . . . . . . . .. . . . . . . . . . .
..z . . . . . . . . . . . . . . . . ..w..; .
. . . .v...: . . . . . . . ..a . . . . . . .
. . . .
.
-
-
-
.._..............~......~................~...........
i
.i
.::
Lcenter]@LM_U
EEa
cg@
LMenu)~~~~O(;;r)
B
gfgg&(
i.... i
.
:.
. . . . . . . . . . . . . . . . . . . . .
. . .. . .
Cm,
~~~~~.
. .
..~..~~~~~~~~~~.~~~:...:.:..:.:
_,.
:.:.:.:.:.:.:..~:.:.:.,.:.,,:.:.:.:
.,,/
You may also want to select settings for the number of data points, averaging, and IF
bandwidth.
240
Makine
Msasursments