Circuit and method of clamping a video signal with first and sec

Details Circuit and method of clamping a video signal with first and sec Circuit and method of clamping a video signal with first and sec

1993-11-01

1995-04-25

Groody, James J.

Television

Image signal processing circuitry specific to television

Dc insertion

348691, H04N 508

Patent

active

054103665

ABSTRACT:
A clamping circuit clamps an input signal applied at an input pin of an integrated circuit package by charging and discharging a series capacitor into the input pin with first and second controlled current sources. The voltage developed at the input pin is compared against a reference signal in either the analog or digital domain to generate control signals to control the first and second current sources. The controlled current sources maintain the proper voltage across the series capacitor to clamp the voltage at the input pin. In the digital embodiment, an analog-to-digital converter and digital filter provide a filtered digital signal to compare against a digital reference to generate the control signals.

REFERENCES:
patent: 5027017 (1991-06-01), Fling

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