A Digital Phase and Frequency Sensitive Detector

Abstract

A description is given of a novel digital phase and frequency-sensitive detector suitable for use in phase-locked loops operating over several octaves in frequency. When the loop is in balance neither the carrier nor its harmonics appear at the output of the detector. The error signal is large and independent of frequency difference when out of phase lock. The performance of the detector in a phase-locked loop operating over two decades of frequency is illustrated.