Characterizing test fixtures

Details Characterizing test fixtures Characterizing test fixtures

2007-04-20

2009-06-09

Nguyen, Vincent Q (Department: 2831)

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Calibration

C324S650000, C702S085000

Reexamination Certificate

active

07545151

ABSTRACT:
Provided herein are techniques for characterizing a test fixture that is used for connecting a device under test (DUT) to a vector network analyzer (VNA), e.g., to thereby enable de-embedding of the test fixture from measurements of the DUT connected to the test fixture. In an embodiment, the test fixture is separated into 4-port test fixture segments, based on which ports of the DUT have internal coupling. Each test fixture segment has an outer 2-port reference plane and an inner 2-port reference plane. A 4-port calibration is performed at outer planes of the two test fixture segments, while corresponding ports of the inner planes of the test fixture segments are connected together with thru segments, to thereby determine a thru set of S-parameters. A set of S-parameters is determined for each of the 4-port test fixture segments, based on the thru set of S-parameters.

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