Device and method used for phase generator phase zero calibration

Abstract

The invention discloses a device used for phase generator phase zero calibration. The device comprises an amplitude control module which is used for adjusting the amplitude of two paths of input sinusoidal signals so that the amplitude is enabled to be within the allowable input amplitude range of a multiply phase discriminator; a signal exchange module which is used for exchanging of the two paths of input sinusoidal signals adjusted by the amplitude control module in the orthogonal phase discrimination operation process; the multiply phase discriminator which is used for performing multiplying on the two paths of sinusoidal signals; a low-pass filter which is used for extracting the DC bias voltage including the phase difference information from the sinusoidal signals outputted by the multiply phase discriminator; an AD sampling module which is used for converting the DC bias voltage extracted by the low-pass filter into digital quantity; and a control and display module which is used for controlling the amplitude control module and the signal exchange module and performing the orthogonal phase discrimination operation on the digital quantity acquired by conversion of the AD sampling module so that the measured signal phase difference can be corrected in real time, the phase zero error can be displayed and the phase zero calibration can be completed.

Description

technical field [0001] The present invention relates to phase calibration techniques. More specifically, it relates to an apparatus and method for phase zero calibration of a phase generator. Background technique [0002] The phase generator is a dual-channel signal generator that simultaneously outputs two signals of the same frequency with a certain phase difference. It is widely used in the calibration of phase measuring equipment such as phase meters and frequency response analyzers. As a phase generator of standard equipment, first of all, it is necessary to ensure that the set phase and the output phase have a linear relationship, and secondly, to ensure that the phase zero point, that is, the phase difference between the output signal channels is zero. With the expansion of the phase measurement frequency range and the improvement of the measurement accuracy, higher requirements are put forward for the frequency range and output phase accuracy of the phase generator....

AI Technical Summary

Problems solved by technology

With the expansion of the phase measurement frequency range and the improvement of measurement accuracy, higher requirements are put forward for the performance of the phase generator's frequency range and output phase accuracy. However, the domestically established low-frequency phase standards below 100kHz cannot fully fulfil requirements

A signal generator is a common general-purpose electronic device. Two signal generators or dual-channel signal generators can form a phase generator. The dual-channel arbitrary

Images