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Proceedings Paper

A PFM based digital pixel with off-pixel residue measurement for 15µm pitch MWIR FPAs
Author(s): Shahbaz Abbasi; Atia Shafique; Arman Galioglu; Omer Ceylan; Melik Yazici; Yasar Gurbuz
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Paper Abstract

Digital pixels based on pulse frequency modulation (PFM) employ counting techniques to achieve very high charge handling capability compared to their analog counterparts. Moreover, extended counting methods making use of leftover charge (residue) on the integration capacitor help improve the noise performance of these pixels. However, medium wave infrared (MWIR) focal plane arrays (FPAs) having smaller pixel pitch are constrained in terms of pixel area which makes it difficult to add extended counting circuitry to the pixel. Thus, this paper investigates the performance of digital pixels employing off-pixel residue measurement. A circuit prototype of such a pixel has been designed for 15μm pixel pitch and fabricated in 90nm CMOS. The prototype is composed of a pixel front-end based on a PFM loop. The frontend is a modified version of conventional design providing a means for buffering the signal that needs to be converted to a digital value by an off-pixel ADC. The pixel has an integration phase and a residue measurement phase. Measured integration performance of the pixel has been reported in this paper for various detector currents and integration times.

Paper Details

Date Published: 20 May 2016
PDF: 7 pages
Proc. SPIE 9819, Infrared Technology and Applications XLII, 981929 (20 May 2016); doi: 10.1117/12.2224791
Show Author Affiliations
Shahbaz Abbasi, Sabanci Univ. (Turkey)
Atia Shafique, Sabanci Univ (Turkey)
Arman Galioglu, Sabanci Univ (Turkey)
Omer Ceylan, Sabanci Univ. (Turkey)
Melik Yazici, Sabanci Univ. (Turkey)
Yasar Gurbuz, Sabanci Univ. (Turkey)

Published in SPIE Proceedings Vol. 9819:
Infrared Technology and Applications XLII
Bjørn F. Andresen; Gabor F. Fulop; Charles M. Hanson; Paul R. Norton, Editor(s)

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