Parabolic voltage generating apparatus for television

Details Parabolic voltage generating apparatus for television Parabolic voltage generating apparatus for television

1986-06-27

1987-07-28

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315368, 315382, H01J 2956

Patent

active

046834052

ABSTRACT:
A dynamic focus voltage generating circuit for television generates a parabolic voltage at the horizontal rate that is responsive to a synchronizing signal. The parabolic voltage is generated from a sawtooth waveform having an upramping portion, a downramping portion and a flat portion such that only the length of the flat portion of the sawtooth waveform varies when the frequency of the synchronizing signal changes.

REFERENCES:
patent: 3422306 (1965-05-01), Gray
patent: 4230972 (1980-10-01), Bafaro
patent: 4258298 (1981-03-01), Hilburn et al.
patent: 4318033 (1982-03-01), Eames, Jr.
A Data Sheet for an IC ICL8038 Made by Intersil Co.

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