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@ARTICLE{Dong:21518,
      author       = {Dong, H. and Zhang, G. and Wang, Y. and Zhang, Y. and Xie,
                      X. and Krause, H.-J. and Braginski, A. and Offenhäusser,
                      A.},
      title        = {{E}ffect of voltage source internal resistance on the
                      {SQUID} bootstrap circuit},
      journal      = {Superconductor science and technology},
      volume       = {25},
      issn         = {0953-2048},
      address      = {Bristol},
      publisher    = {IOP Publ.},
      reportid     = {PreJuSER-21518},
      pages        = {015012},
      year         = {2012},
      note         = {This work is supported by the Knowledge Innovation Program
                      of the Chinese Academy of Sciences (Grant Nos KGCX2-YW-906
                      and KGCX2-EW-105).},
      abstract     = {The voltage-biased SQUID bootstrap circuit (SBC) is
                      suitable for achieving simple and low-noise direct readout
                      of dc SQUIDs. In practice, an ideal voltage bias is
                      difficult to realize because of non-zero internal resistance
                      R-in of the bias voltage source. In order to clearly observe
                      the influence of R-in on the SBC parameters (namely the
                      flux-to-current transfer coefficient (partial derivative
                      I=partial derivative Phi)(SBC) and the dynamic resistance
                      R-d(SBC))and the noise performance, we introduced an
                      additional adjustable resistor R-ad at room temperature to
                      simulate a variable R-in between the SQUID and the
                      preamplifier. We found that the measured SQUID flux noise
                      does not rise, even though R-ad increases significantly.
                      This result demonstrates that a highly resistive connection
                      can be inserted between the liquid-helium-cooled SQUID and
                      the room-temperature readout electronics in the SBC scheme,
                      thus reducing the conductive heat loss of the system. This
                      work will be significant for developing multichannel SBC
                      readout systems, e. g. for biomagnetism, and systems using
                      SQUIDs as amplifiers, for example, in TES-array readout.},
      keywords     = {J (WoSType)},
      cin          = {ICS-8 / PGI-8 / JARA-FIT},
      ddc          = {530},
      cid          = {I:(DE-Juel1)ICS-8-20110106 / I:(DE-Juel1)PGI-8-20110106 /
                      $I:(DE-82)080009_20140620$},
      pnm          = {Grundlagen für zukünftige Informationstechnologien /
                      BioSoft: Makromolekulare Systeme und biologische
                      Informationsverarbeitung},
      pid          = {G:(DE-Juel1)FUEK412 / G:(DE-Juel1)FUEK505},
      shelfmark    = {Physics, Applied / Physics, Condensed Matter},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000298413200025},
      doi          = {10.1088/0953-2048/25/1/015012},
      url          = {https://juser.fz-juelich.de/record/21518},
}