Mitigation of bandwidth limitation induced crosstalk on Athena's WFI

Maximilian Herrmann; Robert Andritschke; Michael Bonholzer; Günter Hauser; Mie S. Magelund; Johannes Müller-Seidlitz; Jonas Reiffers

doi:10.1117/12.2629620

31 August 2022 Mitigation of bandwidth limitation induced crosstalk on Athena's WFI

Maximilian Herrmann, Robert Andritschke, Michael Bonholzer, Günter Hauser, Mie S. Magelund, Johannes Müller-Seidlitz, Jonas Reiffers

Author Affiliations +

Proceedings Volume 12181, Space Telescopes and Instrumentation 2022: Ultraviolet to Gamma Ray; 121810S (2022) https://doi.org/10.1117/12.2629620
Event: SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, Canada

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.

Conference Presentation

Citation Download Citation

Maximilian Herrmann, Robert Andritschke, Michael Bonholzer, Günter Hauser, Mie S. Magelund, Johannes Müller-Seidlitz, and Jonas Reiffers "Mitigation of bandwidth limitation induced crosstalk on Athena's WFI", Proc. SPIE 12181, Space Telescopes and Instrumentation 2022: Ultraviolet to Gamma Ray, 121810S (31 August 2022); https://doi.org/10.1117/12.2629620

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

;

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE