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Phase detector
Electrical circuit detecting phase difference / From Wikipedia, the free encyclopedia
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For autofocus in cameras, see Autofocus § Phase detection.
A phase detector or phase comparator is a frequency mixer, analog multiplier or logic circuit that generates a signal which represents the difference in phase between two signal inputs.
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The phase detector is an essential element of the phase-locked loop (PLL). Detecting phase difference is important in other applications, such as motor control, radar and telecommunication systems, servo mechanisms, and demodulators.