Performance of front-end mixed-signal ASIC for onboard CCD cameras

Hiroshi Nakajima; Shota Inoue; Ryo Nagino; Naohisa Anabuki; Kiyoshi Hayashida; Hiroshi Tsunemi; John P. Doty; Hirokazu Ikeda

doi:10.1117/12.2055658

23 July 2014 Performance of front-end mixed-signal ASIC for onboard CCD cameras

Hiroshi Nakajima, Shota Inoue, Ryo Nagino, Naohisa Anabuki, Kiyoshi Hayashida, Hiroshi Tsunemi, John P. Doty, Hirokazu Ikeda

Author Affiliations +

Proceedings Volume 9154, High Energy, Optical, and Infrared Detectors for Astronomy VI; 91541C (2014) https://doi.org/10.1117/12.2055658
Event: SPIE Astronomical Telescopes + Instrumentation, 2014, Montréal, Quebec, Canada

Abstract

We report on the development status of the readout ASIC for an onboard X-ray CCD camera. The quick low- noise readout is essential for the pile-up free imaging spectroscopy with the future highly sensitive telescope. The dedicated ASIC for ASTRO-H/SXI has sufficient noise performance only at the slow pixel rate of 68 kHz. Then we have been developing the upgraded ASIC with the fourth-order ΔΣ modulators. Upgrading the order of the modulator enables us to oversample the CCD signals less times so that we. The digitized pulse height is a serial bit stream that is decrypted with a decimation filter. The weighting coefficient of the filter is optimized to maximize the signal-to-noise ratio by a simulation. We present the performances such as the input equivalent noise (IEN), gain, effective signal range. The digitized pulse height data are successfully obtained in the first functional test up to 625 kHz. IEN is almost the same as that obtained with the chip for ASTRO-H/SXI. The residuals from the gain function is about 0.1%, which is better than that of the conventional ASIC by a factor of two. Assuming that the gain of the CCD is the same as that for ASTRO-H, the effective range is 30 keV in the case of the maximum gain. By changing the gain it can manage the signal charges of 100 ke-. These results will be fed back to the optimization of the pulse height decrypting filter.

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Hiroshi Nakajima, Shota Inoue, Ryo Nagino, Naohisa Anabuki, Kiyoshi Hayashida, Hiroshi Tsunemi, John P. Doty, and Hirokazu Ikeda "Performance of front-end mixed-signal ASIC for onboard CCD cameras", Proc. SPIE 9154, High Energy, Optical, and Infrared Detectors for Astronomy VI, 91541C (23 July 2014); https://doi.org/10.1117/12.2055658

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KEYWORDS

Charge-coupled devices

Modulators

CCD cameras

Signal processing

X-rays

Analog electronics

Signal to noise ratio

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