Controlled oscillator

Details Controlled oscillator Controlled oscillator

1987-08-31

1989-01-10

LaRoche, Eugene R.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Plural a.f.s. for a single oscillator

331 20, 331 25, 331117FE, H03L 700

Patent

active

047976349

ABSTRACT:
A controlled crystal oscillator of a stereo decoder of a television receiver using CMOS technology includes first, second and third differential emplifiers that produce corresponding first, second and third pairs of anti-phase output signals. The first and second differential amplifiers have variable gains that vary in opposing manners in accordance with a frequency control signal. The oscillatory signal of a crystal is coupled to corresponding input terminals of the three differential amplifiers such that the phase of the signal that is developed at the input terminal of the third differential amplifier is phase-shifted by approximately 90.degree. relative to those developed at the input terminals of the other two amplifiers. The three pairs of output signals are combined to form a single-ended oscillatory signal that is coupled back to the crystal to complete a regulative feedback path. The frequency of oscillation is determined in accordance with the frequency control signal.

REFERENCES:
patent: 4020500 (1977-04-01), Harwood
patent: 4731844 (1988-03-01), Christopher
An Application Note 81 entitled Phased-Lock Loop FM Stereo Demodulator by T. D. Isbele, et al, Dated 1973.

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