Phase response calibration method of nonlinear vector network analyzer based on fine frequency grid calibration
A technology of vector network analysis and calibration method, which is applied in the field of calibration of nonlinear vector network analyzers, can solve the problem of low frequency resolution of phase calibration, and achieve the effect of high frequency resolution
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[0031] The specific embodiment one, the method for the phase response calibration of nonlinear vector network analyzer based on fine frequency grid calibration, it is realized by the following steps:
[0032] Step 1. Use a broadband sampling oscilloscope to detect a radio frequency amplitude modulation signal x AM (t), and employ a square rate detector in the AM signal x AM (t) carrier frequency f c Construct fine frequency gratings on both sides of ;
[0033] The AM signal x AM The expression of (t) is:
[0034]
[0035]
[0036] Where: f c is the carrier frequency and the modulation frequency is f mod , the upper side frequency and lower side frequency are f c -f mod and f c +f mod , V 1 , V 2 , V 3 are the voltages at the above frequency points, respectively, is the phase of the above frequency point;
[0037] Step 2, using the fine frequency grating constructed in step 1 to perform phase calibration on the square rate detector to obtain the fine freque...
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