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Proceedings Paper

Detector control and data acquisition for the Wide-Field Infrared Survey Telescope (WFIRST) with a custom ASIC
Author(s): Brian Smith; Markus Loose; Greg Alkire; Atul Joshi; Daniel Kelly; Eric Siskind; Dino Rossetti; Jonathan Mah; Edward Cheng; Laddawan Miko; Gerard Luppino; Harry Culver; Edward Wollack; David Content
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Paper Abstract

The Wide-Field Infrared Survey Telescope (WFIRST) will have the largest near-IR focal plane ever flown by NASA, a total of 18 4K x 4K devices. The project has adopted a system-level approach to detector control and data acquisition where 1) control and processing intelligence is pushed into components closer to the detector to maximize signal integrity, 2) functions are performed at the highest allowable temperatures, and 3) the electronics are designed to ensure that the intrinsic detector noise is the limiting factor for system performance. For WFIRST, the detector arrays operate at 90 to 100 K, the detector control and data acquisition functions are performed by a custom ASIC at 150 to 180 K, and the main data processing electronics are at the ambient temperature of the spacecraft, notionally ~300 K. The new ASIC is the main interface between the cryogenic detectors and the warm instrument electronics. Its single-chip design provides basic clocking for most types of hybrid detectors with CMOS ROICs. It includes a flexible but simple-to-program sequencer, with the option of microprocessor control for more elaborate readout schemes that may be data-dependent. All analog biases, digital clocks, and analog-to-digital conversion functions are incorporated and are connected to the nearby detectors with a short cable that can provide thermal isolation. The interface to the warm electronics is simple and robust through multiple LVDS channels. It also includes features that support parallel operation of multiple ASICs to control detectors that may have more capability or requirements than can be supported by a single chip.

Paper Details

Date Published: 29 July 2016
PDF: 18 pages
Proc. SPIE 9915, High Energy, Optical, and Infrared Detectors for Astronomy VII, 99152V (29 July 2016); doi: 10.1117/12.2231060
Show Author Affiliations
Brian Smith, Stargazer Systems, Inc. (United States)
Markus Loose, Markury Scientific, Inc. (United States)
Greg Alkire, Stargazer Systems, Inc. (United States)
Atul Joshi, SAAZ Technologies LLC (United States)
Daniel Kelly, AS&D (United States)
Eric Siskind, NYCB Real-Time Computing, Inc. (United States)
Dino Rossetti, Conceptual Analytics, LLC (United States)
Jonathan Mah, Conceptual Analytics, LLC (United States)
Edward Cheng, Conceptual Analytics, LLC (United States)
Laddawan Miko, NASA Goddard Space Flight Ctr. (United States)
Gerard Luppino, GL Scientific (United States)
Harry Culver, NASA Goddard Space Flight Ctr. (United States)
Edward Wollack, NASA Goddard Space Flight Ctr. (United States)
David Content, NASA Goddard Space Flight Ctr. (United States)

Published in SPIE Proceedings Vol. 9915:
High Energy, Optical, and Infrared Detectors for Astronomy VII
Andrew D. Holland; James Beletic, Editor(s)

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