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7 September 2006 A 32x32 CTIA readout design for deep cryogenic applications
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The full potential of far infrared and submillimeter detectors, operating at deep cryogenic temperatures (<4.2K), is only realized if large, two-dimensional arrays of these detectors are developed. The technology for fabricating suitable readouts for such detectors has been one of the main impediments in achieving this objective. In this paper, we present the design parameters of the first 2-side buttable, 32x32 (64x64 mosaic) readout multiplexer, specifically designed for direct-hybrid far IR detector arrays. The readout employs a high open-loop gain, capacitive transimpedance unit-cell design with eight outputs. It features eight selectable gain settings, AC coupling (auto zero) for better input uniformity, sample-and-hold circuitry, and provision to limit 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. Based on the performance of its predecessors, CRC696 and SBRC190, this device is expected to have CDS read noise of better than 100e- at 2K.
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Jam Farhoomand, Lunming Yuen, Alan Hoffman, Nancy Lum, Larry Lum, and Erick Young "A 32x32 CTIA readout design for deep cryogenic applications", Proc. SPIE 6297, Infrared Spaceborne Remote Sensing XIV, 629711 (7 September 2006);

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