24 July 2014 Progress towards a double flux-locked-loop scheme for SQuID readout of TES detector arrays
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Frequency Division Multiplexing technique for reading TES detectors with SQuID devices, requires high loop-gain up to MHz frequency range in the SQuID feedback loop. Such a requirement is difficult to achieve when the feedback loop has a physical length that makes the propagation times of signals not negligible, as in the case in which the readout electronics is placed at room temperature. A novel SQuID readout scheme, called Double Loop-Flux Locked loop (DLFLL), has been proposed earlier. According to this scheme it is possible to make use of a simplified cryogenic electronics, AC coupled, featuring low power dissipation, in order to obtain a cryogenic feedback loop that results in reduced propagation times of signals. The DC and low frequency signals are managed by a standard FLL electronics working at room temperature. Here we present the progress of the integrated Double Loop system.
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Guido Torrioli, Guido Torrioli, Simona Lombardo, Simona Lombardo, Claudio Macculi, Claudio Macculi, Luigi Piro, Luigi Piro, Luca Colasanti, Luca Colasanti, } "Progress towards a double flux-locked-loop scheme for SQuID readout of TES detector arrays", Proc. SPIE 9144, Space Telescopes and Instrumentation 2014: Ultraviolet to Gamma Ray, 91443V (24 July 2014); doi: 10.1117/12.2056317; https://doi.org/10.1117/12.2056317

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