16 September 2011 Reducing the read noise of HAWAII-2RG based detector systems with improved reference sampling and subtraction (IRS2)
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Abstract
In a previous paper,1 we described a method for significantly reducing the read noise of HAWAII-2RG (H2RG) and SIDECAR application specific integrated circuit (ASIC) based detector systems by making better use of reference signals. "Improved Reference Sampling & Subtraction" (IRS2; pronounced "IRS-square") is based on: (1) making better use of the H2RG's reference output, (2) sampling reference pixels more frequently in the time domain, and (3) optimal subtraction of both the reference output and reference pixels in the Fourier domain. Here we demonstrate that IRS2 works as expected using an engineering grade James Webb Space Telescope (JWST) SIDECAR ASIC and H2RG detector array. We were able to reduce the read noise per frame from 25 e- rms using traditional JWST readout to 10 e- rms per frame using IRS2. The only aspect of the system that we changed to make these impressive improvements was the SIDECAR ASIC readout software -we did not change the hardware.
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Bernard J. Rauscher, Richard G. Arendt, D. J. Fixen, Matthew Lander, Don Lindler, Markus Loose, S. H. Moseley, Donna V. Wilson, Christos Xenophontos, "Reducing the read noise of HAWAII-2RG based detector systems with improved reference sampling and subtraction (IRS2)", Proc. SPIE 8155, Infrared Sensors, Devices, and Applications; and Single Photon Imaging II, 81550C (16 September 2011); doi: 10.1117/12.893924; https://doi.org/10.1117/12.893924
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KEYWORDS
James Webb Space Telescope

Sensors

Video

Detector arrays

Analog electronics

Fourier transforms

Readout integrated circuits

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