29 July 2010 VELA: a fast DEPFET readout circuit for the NHXM Mission
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Abstract
NHXM, under study by ASI (Agenzia Spaziale Italiana), is an X-ray observatory in the energy band between 0.5 and 80 keV and will have 3 telescopes dedicated to X-ray imaging with a field of view diameter of 12 arcmin and a focal length of 10 m. We report on the development of high-speed and low-noise readout of a monolithic array of DEPFET detector. The DEPFET based detectors, thanks to an intrinsic low anode capacitance, are suitable as low-energy detectors (from 0.5 to 10 keV) of the new NHXM telescope. The challenging requirements of the NHXM cameras regard the necessity to obtain images and spectra with nearly Fano-limited energy resolution with an absolute time resolution of about 100 μs. In order to exploit the speed capability of the DEPFET array, it has been developed a readout architecture based on the VELA circuit: a drain current readout configuration to implement an extremely fast readout (2 μs/row) and preserve the excellent noise performance of the detector. In the paper the foreseen maximum achievable frame-rate and the best energy resolution will be presented in order to assert the VELA suitability for X-ray imaging and spectroscopy.
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L. Bombelli, L. Bombelli, C. Fiorini, C. Fiorini, A. Marone, A. Marone, M. Uslenghi, M. Uslenghi, M. Fiorini, M. Fiorini, G. E. Villa, G. E. Villa, M. Porro, M. Porro, J. Treis, J. Treis, S. Herrmann, S. Herrmann, A. Wassatsch, A. Wassatsch, } "VELA: a fast DEPFET readout circuit for the NHXM Mission", Proc. SPIE 7732, Space Telescopes and Instrumentation 2010: Ultraviolet to Gamma Ray, 77323N (29 July 2010); doi: 10.1117/12.856398; https://doi.org/10.1117/12.856398
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