AC clamp circuit for video applications

Details AC clamp circuit for video applications AC clamp circuit for video applications

2010-01-21

2011-11-22

Donovan, Lincoln (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Amplitude control

C327S309000, C327S311000

Reexamination Certificate

active

08063688

ABSTRACT:
This invention is a clamp circuit for a video input. The clamp circuit includes: a coupling capacitor; a differential amplifier comparing a video input to predetermined reference voltage; a clamp transistor having a gate connected to the output terminal of the differential amplifier and a source-drain path connected between a power supply voltage and a second terminal; a resistive element connecting the second terminal of the clamp transistor and the coupling capacitor; a first current sink carrying a first predetermined current from the coupling capacitor to ground; and a second current sink carrying a second predetermined current from the second terminal of the said clamp transistor to ground. The resistive element can be a transistor, a resistor, a diode or a switch.

REFERENCES:
patent: 4017749 (1977-04-01), Seki et al.
patent: 5027017 (1991-06-01), Fling

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