Apparatus for maintaining the frequency of an oscillator within

Details Apparatus for maintaining the frequency of an oscillator within Apparatus for maintaining the frequency of an oscillator within

1991-07-16

1992-08-11

Pascal, Robert J.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

331 8, 331 10, 331 25, H03L 700

Patent

active

051382814

ABSTRACT:
The frequency of a local oscillator is maintained within a small frequency window around any one of a number of reference frequencies so that it can lock onto the frequency of an incoming color burst (CHRM). The oscillator (10) may be a current-controlled oscillator. Its control input is switched via a fet (32) to a capacitor (20) charged to a voltage level which will, when connected to the oscillator control input, result in the correct oscillator frequency (Fo). The connection to this capacitor (20) is made when the charge on either one of two control capacitors (22,24) exceeds a threshold value. The threshold values are exceeded when the local oscillator frequency (Fo) is respectively greater than or less than the reference frequency (Fr) by a predetermined frequency difference.

REFERENCES:
patent: 4229759 (1980-10-01), Harwood et al.
patent: 4682209 (1987-07-01), Nillesen

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