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Proceedings Paper

Performance of a state-of-the-art DAC system for FDM readout
Author(s): R. den Hartog; B.-J. van Leeuwen; P. Peille; J. van der Kuur; L. Ravera; D. van Loon; B. Jackson; J.-W. den Herder
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Paper Abstract

The 96 read-out chains which are foreseen in the X-ray Integral Field Unit (XIFU) on ESA's L2 mission Athena to receive the signals from the 3840 X-ray microcalorimeter transition-edge sensors (TES), are based on the principle of Frequency Domain Multiplexing (FDM) with closed-loop baseband feedback (BBFB) to match the dynamic range of the read-out to that of the detectors. The XIFU instrument concept currently undergoes a Phase-A assessment. The Digital-to-Analogue Converters (DACs) which generate the carrier signals of the FDM and the signals of the BBFB loops were identified as critical elements. In this presentation we formulate the dynamic range requirements for the DACs and assess to what extend a current state-of-the-art system, based on Analog Devices AD 9726, meets these requirements. In this context, the need to place resonance frequencies on an exact grid, possibly with the assistance of frequency tuning PID loops, or increased accuracy of the lithographic production of the LC bandpass filters used in FDM, is discussed. Finally, the impact of pulse shape, in particular electrical bandwidth, on DAC performance is assessed.

Paper Details

Date Published: 6 July 2018
PDF: 10 pages
Proc. SPIE 10699, Space Telescopes and Instrumentation 2018: Ultraviolet to Gamma Ray, 106994Q (6 July 2018); doi: 10.1117/12.2312793
Show Author Affiliations
R. den Hartog, SRON Netherlands Institute for Space Research (Netherlands)
B.-J. van Leeuwen, SRON Netherlands Institute for Space Research (Netherlands)
P. Peille, Ctr. National d'Études Spatiales (France)
J. van der Kuur, SRON Netherlands Institute for Space Research (Netherlands)
L. Ravera, Institut de Recherche en Astrophysique et Planétologie (France)
D. van Loon, SRON Netherlands Institute for Space Research (Netherlands)
B. Jackson, SRON Netherlands Institute for Space Research (Netherlands)
J.-W. den Herder, SRON Netherlands Institute for Space Research (Netherlands)


Published in SPIE Proceedings Vol. 10699:
Space Telescopes and Instrumentation 2018: Ultraviolet to Gamma Ray
Jan-Willem A. den Herder; Shouleh Nikzad; Kazuhiro Nakazawa, Editor(s)

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