Patent ID: 6353405
Filing Date: 2002-03-05
Classification: H03M

Abstract:
A video analog-to-digital converter, comprising:a differential correlated double sampling (DCDS) module for sampling a red, a green, and a blue analog signal respectively with a delay time, and selecting one of the sampled red, green and blue analog signals for outputting, wherein the DCDS module comprises three DCDS circuits for sampling the red, the green and the blue analog signals respectively, time delay circuits are connected between the three DCDS circuits, and a multiplexer selects one of the sampled red, green and blue analog signals as an output signal; a DC bias circuit connected to the output of the DCDS module for performing an analog addition to the output signal of the DCDS module and then outputting a biased-signal; an adjustment module for converting the digital adjustment data to an adjustable-reference-voltage; an analog-to-digital converter connected to the output of the DC bias circuit and the output of the adjustment module for converting the biased-signal to a digital-output by referring the adjustable-reference-voltage.