PFD meaning in Electronics ?

Answer: What is Phase Frequency Detector mean?

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.

The phase detector is an essential element of the phase-locked loop (PLL). Detecting phase difference is important other applications, such as motor control, radar and telecommunication systems, servo mechanisms, and demodulators.

reference

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