Frequency mixer group delay measuring circuit and method

Abstract

The invention provides a frequency mixer group delay measuring circuit which comprises a vector network analyzer and a comb generator. The vector network analyzer comprises a first frequency synthesizer, a second frequency synthesizer and a receiver. The output signals of the first frequency synthesizer are divided into two channels through a first coupler, one channel signals are coupled to the radio-frequency signal input end of a frequency mixer to be tested, and the other channel signals are coupled to the receiver. The output signals of the second frequency mixer are coupled to the local oscillating signal input end of the frequency mixer to be tested. The vector network analyzer further comprises a reference oscillator, the output end of the reference oscillator is coupled to the input end of the comb generator, the output end of the comb generator and the output end of the frequency mixer to be tested are coupled to the input end of a second coupler together, and the output end of the second coupler are coupled to the receiver. The frequency mixer group delay measuring circuit can achieve the measurement of the phase position of a measurement channel conveniently and fast, and achieve phase error correction accurately.

Description

technical field [0001] The invention relates to the technical field of testing, in particular to a mixer group delay measurement circuit, and also to a mixer group delay measurement method. Background technique [0002] Frequency conversion devices are common basic components and core devices in radio frequency and microwave transceiver equipment. They are widely used in the uplink and downlink of communication, radar, satellite and other systems. These devices require data transmission with low bit error rate. Frequency conversion The group delay of the device is a key parameter that affects the bit error rate. Group delay is a very important performance index to effectively express phase distortion. How to accurately and quickly measure the group delay characteristics of frequency converters has become an urgent problem to be solved. [0003] At present, the group delay measurement using the vector network analyzer is to calculate the group delay by measuring the phase ra...

AI Technical Summary

Problems solved by technology

[0006] The invention proposes a mixer group delay measurement circuit and method, which solves the problem of cumbersome operation procedures in the existing mixer group delay measurement technology measurement process and calibration process

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