Sawtooth generator with s-correction

Details Sawtooth generator with s-correction Sawtooth generator with s-correction

1987-10-22

1988-11-01

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315387, 358152, H01J 2956, H01J 2970, H04N 504

Patent

active

047822694

ABSTRACT:
In a vertical sawtooth generator, first and second capacitors are coupled in series to a first terminal of a switch. When the switch is conductive, the two capacitors are discharged by the switch to form a sawtooth signal at the first terminal having a down-ramping portion that corresponds with a retrace interval. When the switch is nonconductive, the two capacitors are charged by a source of current to form an upramping portion of the sawtooth signal that corresponds with a trace interval. An S-shaping arrangement that is coupled to a junction terminal of the two capacitors includes a third capacitor two resistors and a clamping arrangement that provide S-shaping of the sawtooth signal at both ends of the trace interval and dc restoring prior to the beginning of each trace interval.

REFERENCES:
patent: 2681383 (1954-06-01), Loe
patent: 3678332 (1972-07-01), Boekhorst
patent: 3842311 (1974-10-01), Knox
patent: 3863106 (1975-01-01), Haferl
patent: 4188567 (1980-02-01), Monroe
A Portion of a Schematic Diagram of a Blaupunkt 100-30 Color Television Chassis Dated Jun., 1985 and an Accompanying Sheet that Includes Corresponding Waveforms, U.S. patent application No. 943,044 entitled, Television Apparatus for Generating a Phase Modulated Deflection Current in the Name of Willem den Hollander.

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