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Proceedings Paper

The first look at SB349, a 32×32 CTIA readout multiplexer for far IR focal-plane arrays
Author(s): Jam Farhoomand; Jeff W. Beeman; Dzung Hoang
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Paper Abstract

Development of two-dimensional cryogenic readouts suitable for far infrared and submillimeter detectors is a key step in fabrication of large format far infrared focal-plane arrays. In collaboration with Raytheon Vision Systems, we have designed and fabricated the first 32x32 readout multiplexer, SB349, capable of operating at cryogenic temperatures as low as 1.7K. This readout is a capacitive-transimpedance amplifier multiplexed to eight outputs and is buttable on two sides to form a 64x64 mosaic array. It features eight selectable gain settings, AC coupling (auto zero) for better input uniformity, sample-and-hold circuitry, and provisions to block the readout glow. A special, 2-micron cryo-CMOS process has been adopted to prevent freeze out and ensure low noise and proper operation at deep cryogenic temperatures. An overview of the design and the results of the initial functionality tests on this device are reported in this paper.

Paper Details

Date Published: 26 September 2007
PDF: 7 pages
Proc. SPIE 6678, Infrared Spaceborne Remote Sensing and Instrumentation XV, 667805 (26 September 2007); doi: 10.1117/12.728668
Show Author Affiliations
Jam Farhoomand, TechnoScience Corp. (United States)
NASA Ames Research Ctr. (United States)
Jeff W. Beeman, TechnoScience Corp. (United States)
Lawrence Berkeley National Lab. (United States)
Dzung Hoang, NASA Ames Research Ctr. (United States)
Enterprise Advisory Services, Inc. (United States)

Published in SPIE Proceedings Vol. 6678:
Infrared Spaceborne Remote Sensing and Instrumentation XV
Marija Strojnik-Scholl, Editor(s)

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