Phase locked loop

Details Phase locked loop Phase locked loop

1986-02-06

1987-10-06

Laroche, Eugene R.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

331 14, 331 20, 358158, H03L 706, H04N 504

Patent

active

046986014

ABSTRACT:
An oscillating circuit using a phase locked loop (PLL) which includes a voltage controlled oscillator (VCO), a phase comparator, a low pass filter (LPF) and a phase extractor has a small circuit scale. Every repeat period of a reference pulse signal being provided to one input terminal of the phase comparator and having a frequency of 1/N times of an oscillating frequency of the VCO, one of leading edges of the output pulses of the VCO near a leading edge of the reference pulse signal is selectively extracting by the phase extractor. The extracted leading edge of the output pulse of the VCO is provided to another input terminal of the phase comparator and phase-compared with the leading edge of the reference pulse signal by the phase comparator. A phase error signal generated from the phase comparator is supplied through the LPF to the VCO as a control voltage thereof in order to stabilize the oscillating frequency.

REFERENCES:
patent: 4059842 (1977-11-01), Meacham
patent: 4400667 (1983-08-01), Belkin
patent: 4422176 (1983-12-01), Summers
patent: 4538119 (1985-08-01), Ashida
patent: 4567447 (1986-01-01), Srivastava et al.

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