A method and system for correcting the frequency response of a precision program-controlled step attenuator

Abstract

The invention discloses a method and system for correcting the frequency response of a precision program-controlled step attenuator, comprising the following steps: calibrating the attenuators connected in series step by step according to the frequency calibration point set by the test instrument, and saving the calibration of the attenuators value; according to the order of frequencies from low to high and the sequence of attenuators in series, compress the calibration data of each level of attenuators, and store the processed calibration data; obtain the expected attenuation according to different combinations of attenuators in series, And search for the attenuation sheet combination with the smallest deviation from the theoretical attenuation at the current frequency point to obtain the optimal solution. The beneficial effects of the invention are: according to the input attenuation, the optimal combination algorithm is used to optimize the combination of the attenuation plates of the program-controlled step attenuator module for compensation, which can meet the signal integrity requirements in a wide frequency range.

Description

technical field [0001] The invention relates to the field of electronic testing, in particular to a frequency response correction method and system for a precision program-controlled step attenuator. Background technique [0002] The program-controlled step attenuator refers to a passive microwave device that uses electrical signals to control the attenuation. Its main function is to accurately attenuate the amplitude of the microwave signal and realize the step attenuation from 0dB to the maximum attenuation of the attenuator. It can be widely used in Various types of automatic test systems. [0003] The attenuation frequency response problem of the precision program-controlled step attenuator is specifically manifested as the higher the frequency, the more obvious the effect of the additional inductance and capacitance on the attenuator. On the whole, the attenuation of the attenuator deviates from the value of the low frequency band, even in the high frequency band. No a...

AI Technical Summary

Problems solved by technology

[0007] 1) The traditional calibration method is a calibration method based on the attenuator compensation value processing based on the measurement results. The actual attenuation of the output signal of the attenuator is not the ideal attenuation, and the problem of signal fluctuation still exists, especially in the wide frequency range. To meet the requirements for signal amplitude stability in specific occasions, it is not conducive to maintaining the integrity and flatness of the signal;

[0008] 2) The coverage of calibration points is limited. The traditional calibration method can only select a specific attenuation of a specific frequency for calibration, and cannot achieve full coverage of attenuation calibration at a certain frequency point, so there are certain limitations;

[0009] 3) Based on the calibration method of the measurement results, the user needs to use the factory calibration data to process the measurement results during use. Different processing algorithms affect the stability of the test data, and the compensation process is more complicated;

[0010] 4) In order to meet the relative accuracy requirements of the frequency response in a wide frequency range, the traditional calibration method is more complicated for production and debugging

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