Horizontal oscillation circuit capable of changing frequency

Oscillators – Automatic frequency stabilization using a phase or frequency... – Afc with logic elements

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331 11, 331 20, 331 34, 331 57, 331 74, 331179, 315399, 327156, 327158, 348540, H03L 700, H03L 7099, G09G 104

Patent

active

057775206

ABSTRACT:
A frequency detection circuit detects the frequency of a horizontal sync signal, and generates a mode switching signal corresponding to the detected frequency. A voltage-controlled oscillator constituting a PLL circuit has a plurality of oscillation modes obtained by dividing a frequency equal to an integer multiple of the frequency of the horizontal sync signal into a plurality of frequency ranges, and oscillates signals in the respective frequency ranges in accordance with control voltages output from a filter. The oscillation modes of the voltage-controlled oscillator are switched in accordance with the mode switching signal output from the frequency detection circuit. In the voltage-controlled oscillator, since the frequency range in each oscillation mode is narrow, the oscillation gain can be suppressed low, and a deterioration in jitter characteristics can be prevented.

REFERENCES:
patent: 4634939 (1987-01-01), Dietz
patent: 5389898 (1995-02-01), Taketoshi et al.
patent: 5399995 (1995-03-01), Kardontchik et al.

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