Lock Indicator Analysis of System of Phase-Locked Loop with Phase-Frequency Detector

This paper describes design of phase-frequency detector with charge pump. It is suggested the recording and the lock indication circuit of signal using detector in tracking loops for frequency and phase of the reference oscillation. Feature of the circuit lock indication is lack of elements requiring frequency adjustment of input signal and ensure a reliable indication of the tracking mode according state of sequential circuit of detector. Lock indicator operation is illustrated by the simulation using system MATLAB.

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