A non-uniformity correction scheme using multiple analog buses for an uncooled infrared sensor

We propose a non-uniformity correction scheme that employs analog buses connecting readout channels to correct the variation of the bias current in uncooled infrared detectors prior to amplification. One analog voltage is selected from an analog bus to adjust the bias voltage of the detectors. We have fabricated 320/spl times/240-pixels sensor with 160 readout channels by using two 16-level analog buses. The variation in the bias current for this sensor decreased to 1/38 (5.2-bit), which helps to improve the sensor's temperature stability. An application of this approach in a flush ADC is also discussed.