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  Mitigation of bandwidth limitation induced crosstalk on Athena's WFI

Herrmann, M., Andritschke, R., Bonholzer, M., Hauser, G., Magelund, M. S., Müller-Seidlitz, J., et al. (2022). Mitigation of bandwidth limitation induced crosstalk on Athena's WFI. In Space Telescopes and Instrumentation 2022: Ultraviolet to Gamma Ray. doi:10.1117/12.2629620.

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Item Permalink: https://hdl.handle.net/21.11116/0000-000C-9F00-1 Version Permalink: https://hdl.handle.net/21.11116/0000-000C-9F01-0
Genre: Conference Paper

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 Creators:
Herrmann, Maximilian1, Author           
Andritschke, Robert1, Author           
Bonholzer, Michael1, Author           
Hauser, Günter1, Author           
Magelund, Mie S., Author
Müller-Seidlitz, Johannes1, Author           
Reiffers, Jonas1, Author           
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1High Energy Astrophysics, MPI for Extraterrestrial Physics, Max Planck Society, ou_159890              

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 Abstract: The wide field imager (WFI) for the ATHENA mission will enable the spectroscopic investigation of solid angles up to 40’ in the x-ray regime between 0.2 keV to 15 keV. The required sensors are planed as DEPFET (DEpleted P-channel field-effect transistor) active pixel matrices. These are readout by custom-designed ASICs called VERITAS in a rolling shutter mode. After column parallel processing of the analog signals row-by-row, the resulting pulse heights are multiplexed onto a differential analog line pair. Thus a transmission undisturbed from external influences is achieved. But successive signals can be affected by the limited rise-time of the VERITAS output stage, depending on the signal height, the multiplexing time and the cable length. In order to investigate the impact on the measurements a dedicated cable harness is used during the characterization of a prototype device. The characterizations are performed using either test pulses applied to the VERITAS or with a 55Fe calibration source illuminating the whole sensor. Different cable lengths and multiplexing times are tested to determine the influences. In order to deal with this effect a crosstalk correction algorithm is implemented for the analysis of the photon data. The determined crosstalk factors range up to 2.8% for the longest measured cablings of 2 m with the shortest multiplexing time. Using shorter cables and longer multiplexing times these factors can be reduced to below 1%. In all cases the accompanying effects in the data analysis can be corrected using the developed algorithm.

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Language(s): eng - English
 Dates: 2022-08-31
 Publication Status: Published online
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 Identifiers: DOI: 10.1117/12.2629620
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Title: SPIE Astronomical Telescopes + Instrumentation,
Place of Event: Montréal, Québec, Canada
Start-/End Date: 2022-07-17 - 2022-07-23

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Title: Space Telescopes and Instrumentation 2022: Ultraviolet to Gamma Ray
Source Genre: Proceedings
 Creator(s):
Nakazawa, Kazuhiro, Author
Nikzad, Shouleh , Author
A. den Herder, Jan-Willem , Author
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Pages: - Volume / Issue: 12181 Sequence Number: - Start / End Page: - Identifier: -

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Title: Proceedings of SPIE
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Publ. Info: Bellingham, WA, USA : Society of Photo-Optical Instrumentation Engineers
Pages: - Volume / Issue: - Sequence Number: 121810S Start / End Page: - Identifier: ISSN: 0277-786X