Patent ID: 8645094

Claim:
A system that calibrates gain associated with a sensor imager, comprising: a plurality of analog amplifiers configured to, for a plurality of nominal analog gain settings, obtain and amplify a test signal during calibration to yield amplified outputs respectively corresponding to the plurality of analog amplifiers, wherein the plurality of analog amplifiers comprise a plurality of column buffers; a digital amplifier configured to adjust the amplified outputs based upon a calibration to compensate for mismatch introduced by the plurality of analog amplifiers; and a feedback component configured to, for each nominal analog gain setting of the plurality of nominal analog gain settings, compare the nominal analog gain setting with an average of actual analog gains respectively measured for the plurality of column buffers set to the nominal analog gain setting to yield a plurality of calibration values respectively corresponding to the plurality of nominal analog gain settings, and to control the calibration of the digital amplifier based upon at least one of the plurality of calibration values.