An Analog Integrated Circuit for Continuous-Time Gain andOffset Calibration of Sensor Arrays

Authors:
Yu-Ming Chiang;John G. Harris
Affiliations:
Computational Neural Engineering Laboratory, ECE Dept., 446 CSE Bldg 42, University of Florida, Gainesville, FL 32611;Computational Neural Engineering Laboratory, ECE Dept., 446 CSE Bldg 42, University of Florida, Gainesville, FL 32611
Venue:
Analog Integrated Circuits and Signal Processing
Year:
1997

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Abstract

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.