Patent ID: 7336214
Filing Date: 2008-02-26
Classification: H03M

Abstract:
1. An image sensor circuit comprising: an array of pixels comprised of rows and columns of pixel circuits; a row driver for supplying respective control signals to rows of said pixel circuits; and respective analog to digital converters connected to receive signals produced by columns of said pixel circuits; wherein each of said analog to digital converters comprises: a group of binary scaled capacitors having respective first nodes coupled to the second input node; and a set of conversion latches connected to respective second nodes of the binary scaled capacitors, the set of conversion latches coupled to receive an output of the comparator section and comprising a logic circuit for selectively applying voltages to respective second nodes of the binary scaled capacitors in response to output values received from the comparator section, wherein signals within an analog to digital converter are amplified by the autozeroing amplifier section before being supplied to the comparator section to reduce the effect of comparator section offset on comparator section decisions.