Method and system for testing a signal path having an operational signal

摘要

A technique for testing a signal path while an operational signal is present is disclosed. The technique may be performed without injecting a test signal into the signal path by using an operational signal already present in the signal path. A method of testing a signal path includes receiving an operational signal from the signal path and estimating a correlation of the operational signal. A system for testing a signal path includes an extractor configured to extract a sample of the operational signal when coupled to a signal path and a correlator configured to estimate a correlation of the operational signal. Various properties of the signal path may be determined using the technique.