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Proceedings Paper

A 25µm pitch LWIR focal plane array with pixel-level 15-bit ADC providing high well capacity and targeting 2mK NETD
Author(s): Fabrice Guellec; Arnaud Peizerat; Michael Tchagaspanian; Eric De Borniol; Sylvette Bisotto; Laurent Mollard; Pierre Castelein; Jean-Paul Zanatta; Patrick Maillart; Michel Zecri; Jean-Christophe Peyrard
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Paper Abstract

CEA Leti has recently developed a new readout IC (ROIC) with pixel-level ADC for cooled infrared focal plane arrays (FPAs). It operates at 50Hz frame rate in a snapshot Integrate-While-Read (IWR) mode. It targets applications that provide a large amount of integrated charge thanks to a long integration time. The pixel-level analog-to-digital conversion is based on charge packets counting. This technique offers a large well capacity that paves the way for a breakthrough in NETD performances. The 15 bits ADC resolution preserves the excellent detector SNR at full well (3Ge-). These characteristics are essential for LWIR FPAs as broad intra-scene dynamic range imaging requires high sensitivity. The ROIC, featuring a 320x256 array with 25μm pixel pitch, has been designed in a standard 0.18μm CMOS technology. The main design challenges for this digital pixel array (SNR, power consumption and layout density) are discussed. The IC has been hybridized to a LWIR detector fabricated using our in-house HgCdTe process. The first electro-optical test results of the detector dewar assembly are presented. They validate both the pixel-level ADC concept and its circuit implementation. Finally, the benefit of this LWIR FPA in terms of NETD performance is demonstrated.

Paper Details

Date Published: 3 May 2010
PDF: 10 pages
Proc. SPIE 7660, Infrared Technology and Applications XXXVI, 76603T (3 May 2010); doi: 10.1117/12.849684
Show Author Affiliations
Fabrice Guellec, CEA Leti (France)
Arnaud Peizerat, CEA Leti (France)
Michael Tchagaspanian, CEA Leti (France)
Eric De Borniol, CEA Leti (France)
Sylvette Bisotto, CEA Leti (France)
Laurent Mollard, CEA Leti (France)
Pierre Castelein, CEA Leti (France)
Jean-Paul Zanatta, CEA Leti (France)
Patrick Maillart, Sofradir (France)
Michel Zecri, Sofradir (France)
Jean-Christophe Peyrard, DGA (France)

Published in SPIE Proceedings Vol. 7660:
Infrared Technology and Applications XXXVI
Bjørn F. Andresen; Gabor F. Fulop; Paul R. Norton, Editor(s)

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