The influence of different length of standard parts on the accuracy of TRL calibration

摘要

This paper mainly studies the influence of the connection errors on the accuracy of the calibration. Through theoretical derivation of the simplified error transfer model, the influence of the introduced error can be obtained by repeatedly introducing errors at the transition; through HFSS-Matlab-API script programming, the simulation results via HFSS and Matlab can be obtained respectivity, which two are very consistent with each other. What's more, introducing errors multiple times to the Device Under Test (DUT) during the process of measurement, the coefficient of variations of the measurement results will appear regularly maxima and minima with the length of standard parts and the different values of the resistance of DUTs. Therefore, in the condition that the standard parts and the connection parts of vector network analyzer have tiny difference, according to the values of DUTs and the length of the standard parts that the minimum value of the coefficient of variations corresponding to, a method that how to design suitable length of fixture and standard parts to reduce the calibration errors to the minimum has been proposed. In addition, the actual productions of the circuits have been measured, and the results are very consistent with the simulation results, which have verified the rationality of the design and the reliability of the simulation.