Analog/digital phase locked loop

Details Analog/digital phase locked loop Analog/digital phase locked loop

1989-08-14

1990-11-13

Mis, David

Oscillators

Automatic frequency stabilization using a phase or frequency...

Plural oscillators controlled

331 1A, 375120, 455208, 455260, H03L 706, H03L 707, H03L 7099

Patent

active

049704745

ABSTRACT:
A phase locked loop (PLL) with a narrow bandwidth, and small phase noise which is particularly useful in a FM stereo decoder includes both analog and digital circuitry and has the advantages of both types of systems, performing better than standard PLL's without the need for any external components. An externally referenced digital voltage controlled oscillator, establishes the center frequency of the PLL while analog portions of the circuit permits accurate locking to the input signal and provides a high level of quietness of the system.

REFERENCES:
patent: 4180783 (1979-12-01), Khalifa
patent: 4313209 (1982-01-01), Drucker
patent: 4577163 (1986-03-01), Culp

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