Improved Performance of TES Bolometers using Digital Feedback
Voltage biased, frequency multiplexed TES bolometers have become a widespread tool in mm-wave astrophysics. However, parasitic impedance and dynamic range issues can limit stability, performance, and multiplexing factors. Here, we present novel methods of overcoming these challenges, achieved throug...
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ftdatacite:10.48550/arxiv.1210.4967 2023-05-15T18:22:31+02:00 Improved Performance of TES Bolometers using Digital Feedback de Haan, Tijmen Smecher, Graeme Dobbs, Matt 2012 https://dx.doi.org/10.48550/arxiv.1210.4967 https://arxiv.org/abs/1210.4967 unknown arXiv https://dx.doi.org/10.1117/12.925658 arXiv.org perpetual, non-exclusive license http://arxiv.org/licenses/nonexclusive-distrib/1.0/ Instrumentation and Methods for Astrophysics astro-ph.IM FOS Physical sciences article-journal Article ScholarlyArticle Text 2012 ftdatacite https://doi.org/10.48550/arxiv.1210.4967 https://doi.org/10.1117/12.925658 2022-04-01T13:36:44Z Voltage biased, frequency multiplexed TES bolometers have become a widespread tool in mm-wave astrophysics. However, parasitic impedance and dynamic range issues can limit stability, performance, and multiplexing factors. Here, we present novel methods of overcoming these challenges, achieved through digital feedback, implemented on a Field-Programmable Gate Array (FPGA). In the first method, known as Digital Active Nulling (DAN), the current sensor (e.g. SQUID) is nulled in a separate digital feedback loop for each bolometer frequency. This nulling removes the dynamic range limitation on the current sensor, increases its linearity, and reduces its effective input impedance. Additionally, DAN removes constraints on wiring lengths and maximum multiplexing frequency. DAN has been fully implemented and tested. Integration for current experiments, including the South Pole Telescope, will be discussed. We also present a digital mechanism for strongly increasing stability in the presence of large series impedances, known as Digitally Enhanced Voltage Bias (DEVB). Text South pole DataCite Metadata Store (German National Library of Science and Technology) South Pole |
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Instrumentation and Methods for Astrophysics astro-ph.IM FOS Physical sciences |
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Instrumentation and Methods for Astrophysics astro-ph.IM FOS Physical sciences de Haan, Tijmen Smecher, Graeme Dobbs, Matt Improved Performance of TES Bolometers using Digital Feedback |
topic_facet |
Instrumentation and Methods for Astrophysics astro-ph.IM FOS Physical sciences |
description |
Voltage biased, frequency multiplexed TES bolometers have become a widespread tool in mm-wave astrophysics. However, parasitic impedance and dynamic range issues can limit stability, performance, and multiplexing factors. Here, we present novel methods of overcoming these challenges, achieved through digital feedback, implemented on a Field-Programmable Gate Array (FPGA). In the first method, known as Digital Active Nulling (DAN), the current sensor (e.g. SQUID) is nulled in a separate digital feedback loop for each bolometer frequency. This nulling removes the dynamic range limitation on the current sensor, increases its linearity, and reduces its effective input impedance. Additionally, DAN removes constraints on wiring lengths and maximum multiplexing frequency. DAN has been fully implemented and tested. Integration for current experiments, including the South Pole Telescope, will be discussed. We also present a digital mechanism for strongly increasing stability in the presence of large series impedances, known as Digitally Enhanced Voltage Bias (DEVB). |
format |
Text |
author |
de Haan, Tijmen Smecher, Graeme Dobbs, Matt |
author_facet |
de Haan, Tijmen Smecher, Graeme Dobbs, Matt |
author_sort |
de Haan, Tijmen |
title |
Improved Performance of TES Bolometers using Digital Feedback |
title_short |
Improved Performance of TES Bolometers using Digital Feedback |
title_full |
Improved Performance of TES Bolometers using Digital Feedback |
title_fullStr |
Improved Performance of TES Bolometers using Digital Feedback |
title_full_unstemmed |
Improved Performance of TES Bolometers using Digital Feedback |
title_sort |
improved performance of tes bolometers using digital feedback |
publisher |
arXiv |
publishDate |
2012 |
url |
https://dx.doi.org/10.48550/arxiv.1210.4967 https://arxiv.org/abs/1210.4967 |
geographic |
South Pole |
geographic_facet |
South Pole |
genre |
South pole |
genre_facet |
South pole |
op_relation |
https://dx.doi.org/10.1117/12.925658 |
op_rights |
arXiv.org perpetual, non-exclusive license http://arxiv.org/licenses/nonexclusive-distrib/1.0/ |
op_doi |
https://doi.org/10.48550/arxiv.1210.4967 https://doi.org/10.1117/12.925658 |
_version_ |
1766201929024667648 |