Video signal clamping circuit

Details Video signal clamping circuit Video signal clamping circuit

1996-07-01

1999-04-06

Peng, John K.

Television

Image signal processing circuitry specific to television

Brightness control

348689, 348690, 348691, 348692, H04N 516, H04N 518

Patent

active

058925554

ABSTRACT:
A video signal clamping circuit for maintaining a constant clamping output level is disclosed including a clamper for generating a clamping output level in response to a reference voltage by use of an external condenser receiving a video signal and a plurality of transistors, a level variation detector for sensing a variation the clamping output level of the clamper and generating a level variation signal corresponding to the variation in the clamping output level, and a reference voltage compensator connected to the level variation detector, for receiving the level variation signal and compensating for the reference voltage of the clamper.

REFERENCES:
patent: 4544951 (1985-10-01), Yoshisato
patent: 4742392 (1988-05-01), Hashimoto
patent: 4821087 (1989-04-01), Honjo
patent: 5008753 (1991-04-01), Kitaura
patent: 5087973 (1992-02-01), Kawahara
patent: 5148055 (1992-09-01), Nohara
patent: 5379075 (1995-01-01), Nagasawa

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