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Proceedings Paper

Low-power low-noise analog circuits for on-focal-plane signal processing of infrared sensors
Author(s): Bedabrata Pain; Sunetra K. Mendis; Robert C. Schober; Robert H. Nixon; Eric R. Fossum
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Paper Abstract

On-focal-plane signal processing circuits for enhancement of IR imager performance are presented. To enable the detection of high background IR images, an in-pixel current-mode background suppression scheme is presented. The background suppression circuit consists of a current memory placed in the feedback loop of a CTIA and is designed for a thousand-fold suppression of the background flux, thereby easing circuit design constraints, and assuring BLIP operation even with detectors having large response non-uniformities. For improving the performance of low-background IR imagers, an on-chip column-parallel analog-to-digital converter (ADC) is presented. The design of a 10-bit ADC with 50 micrometers pitch and based on sigma-delta ((Sigma) -(Delta) ) modulation is presented. A novel IR imager readout technique featuring photoelectron counting in the unit cell is presented for ultra-low background applications. The output of the unit cell is a digital word corresponding to the incident flux density and the readout is noise free. The design of low-power (< 5 (mu) W), sub-electron input-referred noise, high-gain (> 100,000), small real estate (60 micrometers pitch) self-biased CMOS amplifiers required for photon counting are presented.

Paper Details

Date Published: 20 October 1993
PDF: 10 pages
Proc. SPIE 1946, Infrared Detectors and Instrumentation, (20 October 1993); doi: 10.1117/12.158688
Show Author Affiliations
Bedabrata Pain, Columbia Univ. (United States)
Sunetra K. Mendis, Columbia Univ. (United States)
Robert C. Schober, Jet Propulsion Lab. (United States)
Robert H. Nixon, Jet Propulsion Lab. (United States)
Eric R. Fossum, Jet Propulsion Lab. (United States)


Published in SPIE Proceedings Vol. 1946:
Infrared Detectors and Instrumentation
Albert M. Fowler, Editor(s)

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