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8-10 EMBEDDING/
DE-EMBEDDING
In many S-parameter measurements, the measurement of the DUT
may also include other set-up components that affect the overall mea
-
surement result. For example, there may be a test fixture required be
-
tween the normal coaxial calibration planes and the DUT. It may be
useful to see the DUT performance with a certain matching network in
place or it may be desired to see what the subsystem performance
would be when the given DUT is inserted, etc. The classical purposes
of embedding and de-embedding are shown in Figure 8-32, below.
One way of handling these chores within the instrument itself is
through embedding and de-embedding: the process of mathematically
adding or subtracting networks to or from the measured result. This
feature is available in all 37xxxE VNAs as shown in the following
paragraphs.
EMBEDDING/ DE-EMBEDDING MEASUREMENTS
8-62 37xxxE OM
De-embed
DUT
Fixture
DUT
Fixture
DUT
Matching
Network
DUT
Matching
Network
Embed
Calibration Planes
Effective New Measurement Planes
Effective New Measurement Planes
Calibration Planes
Figure 8-32. Classic Embedding and De-embedding