Power sensor module for microwave test systems
AssigneeTeradyne, Inc.
InventorsThomas Michael Craig, Matthew Thomas Begg
Life of this patent
Estimating the term…
Abstract
A module for use in automatic test equipment is disclosed. The module is especially useful for performing power measurements on high frequency devices. The module includes a power sensor and a plurality of EEPROM's that store reflection coefficient data for the power sensor. Computerized control circuitry in the automatic test equipment uses the stored data to reduce impedance mismatch uncertainties in the power measurements.
Claims5
A method of constructing an automatic test system for compensating for errors in the testing of microwave components, comprising:
- (A) measuring a reflection coefficient ΓPS of a modular microwave power sensor;
- (B) storing the reflection coefficient ΓPS in a non-volatile memory provided with the modular microwave power sensor;
- (C) installing the modular microwave power sensor into the automatic test system;
- (D) measuring a plurality of S-parameters of the automatic test system;
- and
- (E) storing the plurality of S-parameters in the automatic test system so that they can be accessed in connection with the reflection coefficient ΓPS from the modular microwave power sensor to correct power measurements of devices under test,
- wherein the modular microwave power sensor is interchangeable with other substantially identical power sensors having different reflection coefficients ΓPS, for providing substantially the same accuracy as the modular microwave power sensor initially installed, without requiring re-calibration of the automatic test system.
A method of constructing an automatic test system for compensating for errors in the testing of microwave components, comprising:
- (A) measuring a reflection coefficient ΓPS of a modular microwave power sensor;
- (B) storing the reflection coefficient ΓPS in a non-volatile memory provided with the modular microwave power sensor;
- (C) installing the modular microwave power sensor into the automatic test system;
- (D) measuring a plurality of S-parameters of the automatic test system;
- (E) storing the plurality of S-parameters in the automatic test system so that they can be accessed in connection with the reflection coefficient ΓPS from the modular microwave power sensor to correct power measurements of devices under test;
- and
- (F) correcting power measurements made by the modular microwave power sensor by applying a correction factor, ΓPS, CORRECTED, which substantially equals S22+(S21S12ΓPS)/(1−ΓPSS11),
- wherein S11, S12, S21, and S22 are at least some of the plurality of S-parameters of the automatic test system.
A method of constructing an automatic test system for compensating for errors in the testing of microwave components, comprising:
- (A) measuring a reflection coefficient ΓPS of a modular microwave power sensor;
- (B) storing the reflection coefficient ΓPS in a non-volatile memory provided with the modular microwave power sensor;
- and
- (C) installing the modular microwave power sensor into the automatic test system,
- wherein the modular microwave power sensor is interchangeable with other substantially identical power sensors having different reflection coefficients ΓPS, for providing substantially the same accuracy as the power sensor initially installed, without requiring re-calibration of the automatic test system.
Dependencies are inferred from the claim text.