Signal processing for digital network analyzer

摘要

A method is provided for processing a radio frequency (RF) signal output by a device under test (DUT), the RF signal having first comb lines in a predetermined first order. The method includes mixing and filtering the RF signal with a multi-tone local oscillator (LO) signal to provide an intermediate frequency (IF) signal having second comb lines corresponding to the first comb lines, where the mixing operation scrambles in frequency the first comb lines of the RF signal such that the second comb lines of the IF signal are in a second order different from the predetermined first order; digitizing the IF signal at a predetermined sampling rate; and descrambling the digitized IF signal with time domain signal processing such that the second comb lines of the digitized IF signal are arranged in the predetermined first order.

主权项

1. A method of processing a radio frequency (RF) signal output by a device under test (DUT), the RF signal having a plurality of first comb lines in a predetermined first order, the method comprising:
mixing and filtering the RF signal with a multi-tone local oscillator (LO) signal to provide an intermediate frequency (IF) signal having a plurality of second comb lines corresponding to the plurality of first comb lines, wherein the mixing scrambles in frequency the first comb lines of the RF signal such that the plurality of second comb lines of the IF signal are in a second order different from the predetermined first order; digitizing the IF signal at a predetermined sampling rate; and descrambling the digitized IF signal with time domain signal processing such that the plurality of second comb lines of the digitized IF signal are arranged in the predetermined first order.