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Journal of Low Temperature Physics

, Volume 92, Issue 5–6, pp 367–413 | Cite as

Self-consistent theory of a voltage-current characteristic and of intrinsic noise of hysteretic RF SQUID

  • Ya. S. Greenberg
Article

Abstract

As well known, in practical RF SQUIDs the electronic components (preamplifier, tank circuit, transmission line) contribute substantially to the output noise of the device. So the output noise of RF SQUID is mainly defined by the slope of its voltage-current characteristics (VCC). However the existing theory of the slope is of semi-empirical manner and does not account for the real VCC slope, i.e., for its fine structure. At the present study in virtue of careful computer simulation the self-consistent theory of VCC fine structure is developed. The simple analytical expressions for the slope which allow to analyze real VCC structure for the practically used parameter 1<1<6 have been obtained. The influence of intrinsic noise of interferometer and of electronic noise on VCC slope has been considered as well. In the frame of the self-consistent theory the contribution of intrinsic interferometer noise to the spectral power of output noise is found. The special attention has been paid to the problem of macroscopic quantum tunneling (MQT) in RF SQUIDs. The analytical expressions are derived which allow to compute the MQT contribution to the VCC slope and to the intrinsic noise of the interferometer.

Keywords

Computer Simulation Fine Structure Magnetic Material Transmission Line Electronic Component 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Plenum Publishing Corporation 1993

Authors and Affiliations

  • Ya. S. Greenberg
    • 1
  1. 1.Novosibirsk Electrotechnical InstituteNovosibirskRussian Federation

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