Automatic fixture removal using one-port measurement

摘要

Scattering parameters of a test fixture having a first port and a second port are measured by providing a test instrument; outputting a one-port reflection test signal from the test instrument to the first port with the second port terminated in a reflective termination having a known reflection coefficient, and receiving at the test instrument a one-port reflection measurement signal from the first port; subjecting the one-port reflection measurement signal to first time gating to generate a first time-gated measurement signal, the first time gating using a first gating function temporally disposed about the first port; subjecting the one-port reflection measurement signal to second time gating to generate a second time-gated measurement signal, the second time gating using a second gating function temporally disposed about the termination; and deriving the scattering parameters from the first time-gated measurement signal and the second time-gated measurement signal.

主权项

1. A system to measure scattering parameters of a test fixture having a first port and a second port, the system comprising:
an input to receive a first time-gated measurement signal and a second time-gated measurement signal obtained by subjecting a one-port measurement signal to time gating, the one-port measurement signal obtained from the first port of the test fixture with the second port of the test fixture terminated in a reflective termination having a known reflection coefficient, the first time-gated measurement signal obtained using a first gating function temporally disposed about the first port, the second time-gated measurement signal obtained using a second gating function temporally disposed about the reflective termination; a first port return loss generator to generate from the first time-gated measurement signal a first port return loss for the test fixture; an insertion loss generator to generate from the second time-gated measurement signal and the reflection coefficient a two-way insertion loss, a first port reverse insertion loss, and a first port forward insertion loss for the test fixture; and a second port return loss generator to generate a second-port return loss for the test fixture from the first port return loss, the two-way insertion loss, the first port reverse insertion loss, the first port forward insertion loss, and the reflection coefficient.