US 2016/0103197 A1 · CORRECTION OF TRANSMISSION LINE INDUCED PHASE AND AMPLITUDE ERRORS IN REFLECTIVITY MEASUREMENTS

Abstract

Various examples of methods and systems are disclosed for correction of phase and amplitude errors that occur in transmission lines connecting transmitter/receiver devices to measurement fixtures. In one example, a method is described that includes using time domain processing to determine a phase shift from the measurement fixture that can occur between calibration measurements and measurements of the specimen under test. In another example, a method is described that includes frequency-domain processing of the signals to obtain both phase and amplitude corrections. Including these phase and amplitude corrections in the calibration procedure can reduce or minimize the errors induced in the measurements when the transmission line(s) experience either temperature changes or physical deflections, among other things.

Claims20

Dependent claims

A method for correction of transmission line induced errors, the method comprising:

collecting frequency dependent reflection data of a specimen under test (SUT) via a transmission line coupled to a measurement fixture;
transforming the frequency dependent reflection data of the SUT to corresponding time domain reflection data of the SUT;
identifying a time location of a reflection from the measurement fixture based on the time domain reflection data of the SUT;
determining a SUT-reference time delay between the time location of the reflection from the measurement fixture in the time domain reflection data of the SUT and a time location of a reflection from the measurement fixture in time domain reflection data of a reflection reference;
and
applying a phase shift correction to the frequency dependent reflection data of the SUT to generate corrected SUT reflection data, the phase shift correction based upon the SUT-reference time delay.

3 more elements

Dependencies are inferred from the claim text.

Correction of transmission line induced phase and amplitude errors in reflectivity measurements

Life of this patent

Correction of transmission line induced phase and amplitude errors in reflectivity measurements

Life of this patent

Abstract

Claims20