Switched-mode frame-scan control circuit for a videofrequency re

Details Switched-mode frame-scan control circuit for a videofrequency re Switched-mode frame-scan control circuit for a videofrequency re

1980-06-04

1981-10-20

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315408, H01J 2970, H01J 2972

Patent

active

042963605

ABSTRACT:
This circuit comprises a saw-tooth signal generating circuit having a single active switch monodirectional in voltage and bidirectional in current, controlled by a cyclic ratio control circuit connected, on the one hand, to a static servo-control circuit so as to ensure optimum operation of the active-switch circuit and, on the other hand, to a dynamic servo-control circuit so as to ensure conformity of the law of variation of the current in the deflector with respect to an S-corrected frame saw-tooth law.
Such a circuit is used in transistorized videofrequency receivers.

REFERENCES:
patent: 4218638 (1980-08-01), Breithaupt

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