Oscillators – Automatic frequency stabilization using a phase or frequency... – Afc with logic elements
Patent
1996-09-27
1998-07-07
Mis, David
Oscillators
Automatic frequency stabilization using a phase or frequency...
Afc with logic elements
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.
Kabushiki Kaisha Toshiba
Mis David
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