Multiplexed video interface system

An apparatus including a multiplexed video interface circuit, the video amplifier circuit comprising:

• a video preamplifier circuit having an input terminal, the video preamplifier configured to receive an input video signal at the input terminal and in accordance therewith provide an output video signal;
• a capacitor coupled to the input terminal of the video preamplifier;
• a first switching circuit coupled between the input terminal of the video preamplifier and a reference voltage supply and configured to receive a clamp pulse and in accordance therewith charge the capacitor with a reference voltage level from the reference voltage supply;
• a bias/brightness circuit configured to provide a DC bias signal;
• a second switching circuit configured to receive a horizontal blanking pulse having first and second signal states, and in accordance therewith couple to the video preamplifier circuit upon receiving the first signal state of the horizontal blanking pulse and couple to the bias/brightness circuit upon receiving the second signal state of the horizontal blanking pulse, wherein said second switching circuit provides a multiplexed video signal comprising said output video signal and said DC bias signal;
• a clamp amplifier configured to receive said multiplexed video signal and a reference signal, and in accordance therewith provide said clamp signal to an external circuit when said multiplexed video signal transcends said reference signal in a first direction;
• and
• a video amplifier configured to receive said multiplexed video signal and the reference signal and in accordance therewith provide said output video signal to said external circuit, when said multiplexed video signal transcends said reference signal in a second direction.

An apparatus including a multiplexed video amplifier interface circuit, the multiplexed video amplifier circuit comprising:

• three video preamplifiers each configured to receive an input video signal and in accordance therewith provide an output video signal;
• three bias/brightness circuits each configured to provide a bias signal;
• three switching circuits each configured to selectively couple to either one of said video preamplifier circuits or one of said bias/brightness circuits 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;
• three clamp amplifiers each 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 amplifiers provide said bias signal to an external circuit;
• and
• three video amplifiers each 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 amplifiers provide said amplified video signal to said external circuit.