Phase locked loop for use with local oscillator

Details Phase locked loop for use with local oscillator Phase locked loop for use with local oscillator

1976-03-11

1977-05-03

Kominski, John

Oscillators

Automatic frequency stabilization using a phase or frequency...

Particular error voltage control

325407, 325419, 325421, 311 11, H03B 304

Patent

active

040217523

ABSTRACT:
A phase locked loop for use with a local oscillator includes a reference signal oscillator, a local oscillator the frequency of which is changed within a predetermined frequency range and a phase comparator for comparing output signals from the reference oscillator and the local oscillator. A low pass filter and a DC amplifier form a phase locked loop with the reference signal oscillator, local oscillator, and phase comparator. The gain of the DC amplifier is controlled in response to the frequency of the local oscillator so as to make its loop gain substantially constant. In accordance with one example of the invention, an FM feedback circuit is provided between the demodulated output side and the input side of the DC amplifier so as to improve the sensitivity of a receiver using the local oscillator.

REFERENCES:
patent: 3209271 (1965-09-01), Smith
patent: 3223943 (1965-12-01), Dumaire et al.
patent: 3231822 (1966-01-01), Tillotson
patent: 3286191 (1966-11-01), Cornwell
patent: 3328719 (1967-06-01), Lisle et al.
patent: 3510779 (1970-05-01), Klapper

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