Improved performance of TES bolometers using digital feedback
Improved performance of TES bolometers using digital feedback
复制标题
使用数字反馈改进 TES 测辐射热计的性能
DOI:
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复制
发表时间:
2012
期刊:
影响因子:
--
通讯作者:
M. Dobbs
中科院分区:
文献类型:
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作者:
T. de Haan;G. Smecher;M. Dobbs
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).
影响因子:
1.6
作者:
Dobbs, M. A.;Lueker, M.;Williamson, R.
通讯作者:
Williamson, R.
DOI:
10.1063/1.3637460
发表时间:
2011
期刊:
The Review of scientific instruments
影响因子:
--
作者:
Schwan
通讯作者:
Schwan