Staring IR-FPA with on-FPA adaptive dynamic range control electr

Details Staring IR-FPA with on-FPA adaptive dynamic range control electr Staring IR-FPA with on-FPA adaptive dynamic range control electr

1995-04-28

1996-10-08

Allen, Stephone

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

250332, 250216, H01L 2700

Patent

active

055634052

ABSTRACT:
An adaptive dynamic range control circuit architecture is disclosed that enables an IR-FPA (10) to achieve a higher dynamic range. The circuit architecture significantly reduces a resolution required for an analog-to-digital converter (ADC 24) that converts the analog output signals of the IR-FPA to a digital representation. In a preferred embodiment of this invention a column CTIA readout integrated circuit architecture is used in conjunction with the adaptive feedback circuitry of this invention to provide pedestal suppression on a per-pixel basis for the IR-FPA. The use of the circuitry of this invention modifies the conventional column CTIA amplifier configuration to a configuration having an auto-zeroed charge ratioed gain stage (50). One advantage to this technique is that by suppressing the charge pedestal, the usable signal output from the IR-FPA can be brought off-chip to the readout integrated circuit at a much higher gain. As a result, the ADC requires fewer bits to resolve the useable signal information and dynamic range.

REFERENCES:
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patent: 4786831 (1988-11-01), Morse et al.
patent: 4956716 (1990-09-01), Hewitt et al.
patent: 4975864 (1990-12-01), Sendall et al.
patent: 4978872 (1990-12-01), Morse et al.
patent: 5323334 (1994-06-01), Meyers et al.
patent: 5391873 (1995-02-01), Cuthbertson

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