Electronic Phase Detector
Some signal processing techniques such as those used in radar may require both the amplitude and the phase of a signal, to recover all the information encoded in that signal. One technique is to feed an amplitude-limited signal into one port of a product detector and a reference signal into the other port; the output of the detector will represent the phase difference between the signals. If the signal is different in frequency from the reference, the detector output will be periodic at the difference frequency.
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