Patent ID: 6208094
Filing Date: 2001-03-27
Classification: H04N

Abstract:
An apparatus including a multiplexed video amplifier interface circuit, the multiplexed video amplifier circuit comprising:a video preamplifier configured to receive an input video signal and in accordance therewith provide an output video signal;a bias/brightness DC circuit configured to provide a bias signal;a switching circuit configured to selectively couple to either said video preamplifier circuit or said bias/brightness DC circuit to receive said output video signal and said bias signal, and in accordance therewith provide a multiplexed video signal comprising said output video signal and said bias signal;a clamp amplifier configured to receive said multiplexed video signal and a reference signal, wherein when said multiplexed video signal transcends said reference signal in a first direction, said clamp amplifier provides said bias signal to an external circuit; anda video amplifier configured to receive said multiplexed video signal and said reference signal, wherein when said multiplexed video signal transcends said reference signal in a second direction, said video amplifier provides said amplified video signal to said external circuit.