Joint estimation of coefficients for skew, gain imbalance and channel response for signal sources

摘要

A test and measurement system includes a signal creation tool to generate a complex-valued stimulus signal, at least one waveform generator to receive the stimulus signal and produce at least one pair of baseband signals, a test instrument to capture the at least one pair of baseband signals and produce captured baseband signals, a pre-compensation coefficients estimation block to receive the captured baseband signals, characterize the captured baseband signals and to generate pre-compensation coefficients, and a pre-compensation block to apply the pre-compensation coefficients to the complex-valued stimulus signal when there is a device under test.;A method of characterizing a test system includes generating a multi-tone stimulus signal, producing at least one pair of baseband signals form the multi-tone stimulus signal, capturing the at least one pair of baseband signals with a test instrument, characterizing the at least one pair of baseband signals to generate pre-compensation coefficients, and applying the pre-compensation coefficients to signals applied to a device under test.