Switched capacitor S-correction circuit

Details Switched capacitor S-correction circuit Switched capacitor S-correction circuit

1983-12-16

1985-08-06

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315408, H01J 2970, H01J 2976

Patent

active

045338558

ABSTRACT:
An S-correction circuit for a video display apparatus provides switchable amounts of correction in a given line deflection interval in order to satisfy the requirements of cathode ray tubes having large deflection angles or complex curvature faceplates. A second S-shaping capacitor is coupled in parallel with the main S-shaping capacitor by action of a switching transistor. The time at which the transistor is switched may be controlled, for example, by modulating the switching point at a vertical rate, in order to increase the flexibility of the correction circuit.

REFERENCES:
patent: 4019093 (1977-04-01), Klein
patent: 4176303 (1979-11-01), Babcock et al.
patent: 4181874 (1980-01-01), Babcock
patent: 4281275 (1981-07-01), Chapman et al.

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