Patent ID: 7236203

Claim:
An apparatus including video circuitry for controlling signal gain and reference black level of a video signal, comprising: video signal control circuitry responsive to a first video signal, a reference voltage and a digital control signal by providing a second video signal corresponding to said first video signal and having a reference black level determined by a magnitude of said reference voltage, wherein said first video signal has a first magnitude, said second video signal has a second magnitude and a ratio of said first and second video signal magnitudes is determined by said digital control signal; and voltage reference generator circuitry coupled to said video signal control circuitry, responsive to said digital control signal by providing said reference voltage with said reference voltage magnitude determined by said digital control signal, and including voltage source circuitry to provide an internal voltage having a magnitude, and voltage conversion circuitry coupled to said voltage source circuitry and responsive to said internal voltage and said digital control signal by providing said reference voltage, wherein a ratio of said internal and reference voltage magnitudes is determined by said digital control signal.