Sawtooth waveform generation for a television receiver

Details Sawtooth waveform generation for a television receiver Sawtooth waveform generation for a television receiver

1979-09-21

1982-06-08

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

307228, H01J 2970, H01J 2976

Patent

active

043341748

ABSTRACT:
A method and electronic circuit are described for generating a sawtooth waveform for vertical deflection of a television receiver's cathode ray tube. The method is effected by a circuit which includes a single capacitor which is charged to develop the ramp portion of the sawtooth. In response to a vertical sync pulse, the circuit discharges the capacitor and compares the capacitor's discharge voltage to a predetermined threshold voltage. When the latter two voltages are substantially equal to each other, discharge of the capacitor is discontinued, thus generating a sawtooth waveform across the capacitor. The capacitor begins charging again to form another ramp voltage and is discharged on receipt of the next vertical sync pulse. The charge and discharge of the capacitor repeats as successive vertical sync pulses are received.

REFERENCES:
patent: 3484624 (1969-12-01), Rasiel et al.
patent: 3659115 (1972-04-01), Montgomery
patent: 4047052 (1977-09-01), Koubek et al.

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