Anritsu 37 C Series, Operation Manual, Page: 185 / 603

Now we have an interesting situation. While we can measure the per-
formance at the connector— which is the calibration plane— what we
really want to know is how our device performs (Figure 8-21).
You can consider the device embedded in the fixture and can measure
the S-Parameters of the fixture with the device installed.
The most elementary situation is a system in which the test fixture is
electrically ideal or transparent. In this case the solution is sim-
ple—merely move the reference plane out to the device (Figure 8-22).
37XXXC OM 8-25
MEASUREMENTS ACTIVE DEVICE
Figure 8-20. Active Device Test Fixture
F E T
G P C - 7
S
1 1
M
G P C - 7
S
1 1
Figure 8-21. Test Device, What It Looks Like
DE-EMBEDDING
Remove or “De-embed” The Ef-
fects of the Fixture