CMOS Baseline Subtraction Readout Circuit for Infrared Sensors

A.P. Anumula, M.L. Reed, and T.N. Blalock (USA)


Bolometer, Offset Correction, Infrared, Switched Current Cell


This paper discusses a new CMOS baseline and offset correction scheme for infrared bolometer focal plane arrays. The readout circuit allows for pixel level baseline subtraction eliminating most sources of per-pixel fixed pattern error and conside rably reducing imaging system complexity and overhead. The readout scheme includes a regulated constant voltage detector interface, a switched current offset correction circuit, and an integrator. Simulation results illustrate the high linearity and low noise of the readout circuit.

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