An Analog Integrated Circuit for Continuous-Time Gain and Offset Calibration of Sensor Arrays
Parameter variations cause unavoidable nonuniformitiesin Infra-Red Focal Plane Arrays and other integrated sensors.Since these nonuniformities change slowly with time, calibratingsensors one-time only is not suitable-much more frequentcalibration is required. We have developed an algorithm thatcontinually calibrates an array of sensors that contain gainand offset variations. This algorithm has been mapped to analoghardware and designed and fabricated with a 2um CMOS technology.Measured results from the chip show that the system achievesinvariance to gain and offset variations of the input signal.