Clamp circuit for RGB output stages

Details Clamp circuit for RGB output stages Clamp circuit for RGB output stages

1978-02-17

1979-12-11

Griffin, Robert L.

Facsimile and static presentation processing

Static presentation processing

Attribute control

H04N 516

Patent

active

041786106

ABSTRACT:
A circuit utilizing a single clamp, and therefore requiring only a single bias supply, to DC clamp the inputs of the three chrominance amplifiers is shown. The clamp employs a switch that is connected to the bias supply and coupled by separate diodes to the inputs of the chrominance amplifiers. The switch and diodes are conductive only during the horizontal retrace period. As a result, during the retrace period, the amplifier inputs are clamped to a DC value determined by the bias supply; during the trace, or information-bearing period the inputs are isolated from the supply, as well as from each other.

REFERENCES:
patent: 2901534 (1959-08-01), Oakley
patent: 2935556 (1960-05-01), Barco
patent: 3535436 (1970-10-01), Limberg
patent: 3729577 (1973-04-01), Buell
patent: 3736370 (1973-05-01), Thielking

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