Focal plane processor for IR detection

Radiant energy – Infrared-to-visible imaging – Including detector array

Reexamination Certificate

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Reexamination Certificate

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07135680

ABSTRACT:
A focal plane array detector in a sensor for IR imaging. Pixel readout and analog to digital conversion is performed in an integrated circuit which includes the imaging array. The charge of each pixel is accumulated in a capacitor (16) and a digital to analog charge converter cancels this charge. A controller controls this charge converter providing the appropriate amount of charge. An analog to digital converter incorporating a comparator (92) switches the controller on/off. In some embodiment a programmable device external to the sensor participates in the control of the analog to digital converter. In a typical embodiment of the invention a cycle generator controls the charge output of the digital to analog converter. In a preferred embodiment the analog to digital converters are grouped wherein all such converters group operate simultaneously.

REFERENCES:
patent: 5811808 (1998-09-01), Cannata et al.
patent: 6147340 (2000-11-01), Levy
patent: 2005/0072923 (2005-04-01), Elkind et al.
Stuart Kleinfelder et al., “Focal plane array readout integrated circuit with per-pixel analog-to-digital and digital-to-analog conversion.” Infrared Detectors and Focal Plane Arrays VI, Proceedings of SPIE vol. 4028 (2000) pp. 139-147.

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