6 MEASUREMENT DATA ANALYSIS
194
The circuit being removed should be defined in the data file containing S-parameters of
this circuit. The circuit should be described as a 2-port in Touchstone file (extension
.s2p), which contains the S-parameter table: S11, S
21, S
12, S
22 for a number of
frequencies.
The de-embedding function allows to mathematically exclude from the measurement
results the effect of the fixture circuit existing between the calibration plane and the
DUT in the real network. The fixture is used for the DUTs, which cannot be directly
connected to the test ports.
The de-embedding function shifts the calibration plane closer to the DUT, so as if the
calibration has been executed of the network with this circuit removed (See figure 6.13).
Figure 6.13 De-embedding
DUT
Port
1
Port
2
Calibration
plane
Circuit 1
Touchstone
file
Circuit 2
Touchstone
file
Calibration
plane
DUT
Port
1
Port
2
Calibration
plane
Calibration
plane
De
-
embedding
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