26 September 2007 The first look at SB349, a 32×32 CTIA readout multiplexer for far IR focal-plane arrays
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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.
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Jam Farhoomand, Jam Farhoomand, Jeff W. Beeman, Jeff W. Beeman, Dzung Hoang, Dzung Hoang, } "The first look at SB349, a 32×32 CTIA readout multiplexer for far IR focal-plane arrays", Proc. SPIE 6678, Infrared Spaceborne Remote Sensing and Instrumentation XV, 667805 (26 September 2007); doi: 10.1117/12.728668; https://doi.org/10.1117/12.728668
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