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Proceedings Paper

Gated multicycle integrator (GMCI): a readout circuit for repetitive imaging of FPA
Author(s): Haijiang Ou; Ken K. Chin
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Paper Abstract

A gated multi-cycle integrator (GMCI) is presented to recover weak repetitive image signal from strong background. The GMCI could operate in several modes such as Capacitive- transimpedance amplifier (CTIA), gated integration (GI) and background-cancellation integration (BCI). When GMCI operates at BCI mode, the storage well of a pixel is mainly used for signal integration even there exists strong background or large dark current. Thus the signal-to-noise ratio (SNR), dynamic range and the sensitivity of detection are greatly improved. In addition, the transmission windows of BCI peak at odd harmonics of the modulation frequency. Therefore the detector's 1/f and other low frequency noises can be attenuated. A switched capacitor integrator (SCI) was designed to carry out the performance of GMCI. The switch induced fixed pattern can be obliterated by taking the differentia of two multi-cycle integrated signals with 180° phase difference. Preliminary chip test shows that the GMCI can read out modulated signal that is five orders less than the background.

Paper Details

Date Published: 10 October 2001
PDF: 8 pages
Proc. SPIE 4369, Infrared Technology and Applications XXVII, (10 October 2001); doi: 10.1117/12.445320
Show Author Affiliations
Haijiang Ou, New Jersey Institute of Technology (United States)
Ken K. Chin, New Jersey Institute of Technology (United States)

Published in SPIE Proceedings Vol. 4369:
Infrared Technology and Applications XXVII
Bjorn F. Andresen; Gabor F. Fulop; Marija Strojnik, Editor(s)

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