Deflection circuit having a controllable sawtooth generator

Details Deflection circuit having a controllable sawtooth generator Deflection circuit having a controllable sawtooth generator

H - Electricity

04

N

H04N 3/16 (2006.01) G01R 13/24 (2006.01) G09G 1/04 (2006.01) H03K 4/12 (2006.01) H04N 3/223 (2006.01)

Patent

CA 2089291

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 more than one-half of the length of vertical trace portion after vertical trace is initiated. The feedback current is coupled to a capacitor to develop a capacitor voltage. The capacitor 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.

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