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Proceedings Paper

A fast event preprocessor for the Simbol-X Low-Energy Detector
Author(s): T. Schanz; C. Tenzer; E. Kendziorra; A. Santangelo
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Paper Abstract

The Simbol-X1 Low Energy Detector (LED), a 128 × 128 pixel DEPFET array, will be read out very fast (8000 frames/second). This requires a very fast onboard data preprocessing of the raw data. We present an FPGA based Event Preprocessor (EPP) which can fulfill this requirements. The design is developed in the hardware description language VHDL and can be later ported on an ASIC technology. The EPP performs a pixel related offset correction and can apply different energy thresholds to each pixel of the frame. It also provides a line related common-mode correction to reduce noise that is unavoidably caused by the analog readout chip of the DEPFET. An integrated pattern detector can block all invalid pixel patterns. The EPP has an internal pipeline structure and can perform all operation in realtime (< 2 μs per line of 64 pixel) with a base clock frequency of 100 MHz. It is utilizing a fast median-value detection algorithm for common-mode correction and a new pattern scanning algorithm to select only valid events. Both new algorithms were developed during the last year at our institute.

Paper Details

Date Published: 15 July 2008
PDF: 10 pages
Proc. SPIE 7011, Space Telescopes and Instrumentation 2008: Ultraviolet to Gamma Ray, 70112V (15 July 2008); doi: 10.1117/12.789410
Show Author Affiliations
T. Schanz, Institute for Astronomy and Astrophysics, Eberhard Karls Univ. of Tübingen (Germany)
C. Tenzer, Institute for Astronomy and Astrophysics, Eberhard Karls Univ. of Tübingen (Germany)
E. Kendziorra, Institute for Astronomy and Astrophysics, Eberhard Karls Univ. of Tübingen (Germany)
A. Santangelo, Institute for Astronomy and Astrophysics, Eberhard Karls Univ. of Tübingen (Germany)


Published in SPIE Proceedings Vol. 7011:
Space Telescopes and Instrumentation 2008: Ultraviolet to Gamma Ray
Martin J. L. Turner; Kathryn A. Flanagan, Editor(s)

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