Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1997-06-23
1999-08-31
Westin, Edward P.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
315387, 315403, H04N 316, H01J 2970
Patent
active
059457929
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 and to a reference signal generates a feedback current at a time that occurs between the center of vertical trace and the end of trace and away from the center of trace. The feedback current is determined in accordance with a difference between the sawtooth signal and the reference signal. The feedback current is coupled to a first capacitor to develop a gain 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.
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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. Pat.#5587631.
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Gardner Shane R.
Henig Sammy S.
Laks Joseph J.
Thomson Multimedia S.A.
Tripoli Joseph S.
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