Patent ID: 8994832
Filing Date: 2015-03-31
Classification: H03M,H04N

Abstract:
1. An apparatus comprising: a pixel array having a set of columns of pixels; analog-to-digital (A/D) conversion circuitry coupled with the pixel array, the A/D conversion circuitry operable to convert analog image data from the pixel array to digital image data, the A/D conversion circuitry comprising: a voltage ramp generator that is operable in a first state to generate a single slope voltage ramp, and that is operable in a second state to generate a multiple slope voltage ramp; a set of column A/D conversion circuits coupled with the voltage ramp generator, each of the column A/D conversion circuits corresponding to one of the columns of pixels; and at least one counter coupled with the set of column A/D conversion circuits; and calibration circuitry coupled with the set of column A/D conversion circuits, the calibration circuitry operable to determine digital calibration data to adjust the digital image data, the calibration circuitry operable to provide analog calibration data that spans a calibration range to the set of column A/D conversion circuits instead of the analog image data from the pixel array being provided to the set of column A/D conversion circuits.