A phase detector or phase comparator is a frequency mixer, analog multiplier or logic circuit that generates a voltage signal which represents the difference in phase between two signal inputs. It is an essential element of the phase-locked loop (PLL).
Detecting phase differences is very important in many applications, such as motor control, radar and telecommunication systems, servo mechanisms, and demodulators.
Read more about Phase Detector: Types, Electronic Phase Detector, Optical Phase Detectors
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