Sawtooth generator controlled in a gain control feedback loop

Details Sawtooth generator controlled in a gain control feedback loop Sawtooth generator controlled in a gain control feedback loop

1996-08-29

1997-09-30

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

H01J 2970, H01J 2976

Patent

active

056729421

ABSTRACT:
In a vertical sawtooth generator of a vertical deflection circuit, a first comparator generates an output signal when a retrace portion of a sawtooth signal is at a first magnitude to initiate a vertical trace portion of the sawtooth signal. An amplifier responsive to the sawtooth signal generates a feedback current at a time that occurs between the center of vertical trace and the end of trace and away from each of the center and end of trace. The feedback current is coupled to a first capacitor to develop a control voltage. The control voltage is applied via a voltage-to-current converter to an integrating capacitor to develop in the integrating capacitor the trace portion of the sawtooth signal. The control voltage is initialized during a power start-up interval.

REFERENCES:
patent: 4277729 (1981-07-01), Rodgers, III
patent: 4314183 (1982-02-01), Heuze et al.
patent: 4490653 (1984-12-01), Olmstead
patent: 4686432 (1987-08-01), Berland et al.
patent: 4737691 (1988-04-01), den Hollander et al.
patent: 5185672 (1993-02-01), Rousseau et al.
patent: 5216336 (1993-06-01), Rodriguez-Cavazos
patent: 5220253 (1993-06-01), Koblitz et al.
patent: 5250879 (1993-10-01), Koblitz
Appl. Ser. No. 843,074, filed Mar. 2, 1992 in the names of Wilber et al. and entitled Resistor-Matched Deflection Apparatus For a Video Display, abandoned for App. Ser. No. 965,310, filed Oct. 23, 1992 in the names of Wilber et al. and entitled Resistor-Matched Deflection Apparatus For a Video Display.
An article entitled A New Video Process for Color TV in the names of Yamamoto et al., dated 1988 and publ. by IEEE.

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