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Detector Control and Data Acquisition for the Wide-Field Infrared Survey Telescope (WFIRST) with a Custom ASICThe 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 approx.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.
Document ID
Acquisition Source
Goddard Space Flight Center
Document Type
Conference Paper
Smith, Brian S.
(Stargazer Systems, Inc. Annapolis, MD, United States)
Loose, Markus
(Markury Scientific, Inc. Thousand Oaks, CA, United States)
Alkire, Greg
(Stargazer Systems, Inc. Annapolis, MD, United States)
Joshi, Atul
(SAAZ Micro, Inc. Westlake Village, CA, United States)
Kelly, Daniel
(ASRC Federal Space and Defense Greenbelt, MD, United States)
Siskind, Eric
(NYCB Real-Time Computing, Inc. Lattingtown, NY, United States)
Rossetti, Dino
(SGT, Inc. Greenbelt, MD, United States)
Mah, Jonathan
(SGT, Inc. Greenbelt, MD, United States)
Cheng, Edward
(SGT, Inc. Greenbelt, MD, United States)
Miko, Laddawan
(NASA Goddard Space Flight Center Greenbelt, MD United States)
Luppino, Gerard
(GL Scientific, Inc. Honolulu HI, United States)
Culver, Harry
(NASA Goddard Space Flight Center Greenbelt, MD United States)
Wollack, Edward
(NASA Goddard Space Flight Center Greenbelt, MD United States)
Content, David
(NASA Goddard Space Flight Center Greenbelt, MD United States)
Date Acquired
August 2, 2016
Publication Date
June 26, 2016
Subject Category
Electronics And Electrical Engineering
Instrumentation And Photography
Report/Patent Number
Meeting Information
Meeting: SPIE Astronomical Telescopes and Instrumentation Symposium
Location: Edinburgh
Country: United Kingdom
Start Date: June 26, 2016
End Date: July 1, 2016
Sponsors: International Society for Optical Engineering
Funding Number(s)
Distribution Limits
Public Use Permitted.
data acquisition
aplication specific integrated circuits
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