Digital phase-locked loop

Details Digital phase-locked loop Digital phase-locked loop

1990-11-20

1991-11-12

Mis, David

Oscillators

Automatic frequency stabilization using a phase or frequency...

With intermittent comparison controls

331 1A, 331 17, 331 20, H03L 714

Patent

active

050651153

ABSTRACT:
A digital phase-locked loop comprises a phase comparator, a controllable oscillator whose output signal is compared with an input signal in the phase comparator, and a loop filter preceding the oscillator. The filter comprises a clocked input register for storing the last phase-measuring value of the phase comparator, and an integrator which comprises a clocked register whose output signal is fed back to the register input. When the input signal of the phase comparator is absent or disturbed, a switching signal is generated which immediately erases the input register in the loop filter and after whose appearance the register in the integrator of the loop filter is reset to zero within a limited number of clock cycles.

REFERENCES:
patent: 3882412 (1975-05-01), Apple, Jr.

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