29 July 2016 Detector control and data acquisition for the wide field infrared survey telescope (WFIRST) with a custom ASIC
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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.
© (2016) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Brian Smith, Brian Smith, Markus Loose, Markus Loose, Greg Alkire, Greg Alkire, Atul Joshi, Atul Joshi, Daniel Kelly, Daniel Kelly, Eric Siskind, Eric Siskind, Dino Rossetti, Dino Rossetti, Jonathan Mah, Jonathan Mah, Edward Cheng, Edward Cheng, Laddawan Miko, Laddawan Miko, Gerard Luppino, Gerard Luppino, Harry Culver, Harry Culver, Edward Wollack, Edward Wollack, David Content, David Content, } "Detector control and data acquisition for the wide field infrared survey telescope (WFIRST) with a custom ASIC", Proc. SPIE 9915, High Energy, Optical, and Infrared Detectors for Astronomy VII, 99152V (29 July 2016); doi: 10.1117/12.2231060; https://doi.org/10.1117/12.2231060
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