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Proceedings Paper

VELA: a fast DEPFET readout circuit for the NHXM Mission
Author(s): L. Bombelli; C. Fiorini; A. Marone; M. Uslenghi; M. Fiorini; G. E. Villa; M. Porro; J. Treis; S. Herrmann; A. Wassatsch
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Paper 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.

Paper Details

Date Published: 29 July 2010
PDF: 8 pages
Proc. SPIE 7732, Space Telescopes and Instrumentation 2010: Ultraviolet to Gamma Ray, 77323N (29 July 2010); doi: 10.1117/12.856398
Show Author Affiliations
L. Bombelli, Politecnico di Milano (Italy)
Istituto Nazionale di Fisica Nucleare (Italy)
C. Fiorini, Politecnico di Milano (Italy)
Istituto Nazionale di Fisica Nucleare (Italy)
A. Marone, Politecnico di Milano (Italy)
Istituto Nazionale di Fisica Nucleare (Italy)
M. Uslenghi, INAF - IASF Milano (Italy)
M. Fiorini, INAF - IASF Milano (Italy)
G. E. Villa, INAF - IASF Milano (Italy)
M. Porro, Max-Planck-Institut für extraterrestrische Physik (Germany)
Max-Planck-Institut Halbleiterlabor (Germany)
J. Treis, Max-Planck-Institut Halbleiterlabor (Germany)
Max-Planck-Institute for Solar System Research (Germany)
S. Herrmann, Max-Planck-Institut für extraterrestrische Physik (Germany)
Max-Planck-Institut Halbleiterlabor (Germany)
A. Wassatsch, Max-Planck-Institut für extraterrestrische Physik (Germany)
Max-Planck-Institut für Physik (Germany)


Published in SPIE Proceedings Vol. 7732:
Space Telescopes and Instrumentation 2010: Ultraviolet to Gamma Ray
Monique Arnaud; Stephen S. Murray; Tadayuki Takahashi, Editor(s)

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