Phase detector for a phase-lock-loop

Details Phase detector for a phase-lock-loop Phase detector for a phase-lock-loop

1994-07-18

1995-06-20

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

331 20, 331 27, 327159, H03L 7085

Patent

active

054263972

ABSTRACT:
A phase-lock-loop circuit for generating a clock signal at a frequency higher than a horizontal frequency of a video signal includes a phase detector. The phase detector includes a flip-flop that is set when a horizontal sync pulse occurs. An output of a counter that provides frequency division is decoded for resetting the flip-flop in each horizontal period. Other than for the flip-flop, and for the counting stages of the counter, only combinational logic components are used for producing a phase error indicative signal that is coupled via a low-pass filter to a control input of an oscillator of the phase-lock-loop circuit.

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