A Method for Simulating A Flux-Locked Dc Squid

G. M. Gutt, N. Jeremy Kasdin, M. R. Condron, B. Muhlfelder, J. M. Lockhart, W. W. Hansen, M. W. Cromar

Research output: Contribution to journalLetter

2 Scopus citations

Abstract

Many high precision experiments place severe requirements on the noise, linearity and slew rate of flux-locked dc SQUID systems (linearity requirement approaches 1 in 106 for Gravity Probe-B). A computationally efficient and accurate method of simulating a dc SQUID's V-ϕ and I-V characteristics has proven valuable in evaluating and improving various SQUID readout methods. The simulation of the SQUID is based on fitting of previously acquired data from either a real or a modeled device using the Fourier transform of the V-E curve. This method does not predict SQUID behavior, but rather is a way of replicating a known behavior efficiently with portability into various simulation programs such as SPICE. In this paper we discuss the methods used to simulate the SQUID and the flux-locking control electronics and present specific examples of this approach. Results include an estimate of the slew rate and linearity of a simple flux-locked loop using a characterized dc SQUID.

Original languageEnglish (US)
Pages (from-to)1837-1840
Number of pages4
JournalIEEE Transactions on Applied Superconductivity
Volume3
Issue number1
DOIs
StatePublished - Jan 1 1993
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering
  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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    Gutt, G. M., Kasdin, N. J., Condron, M. R., Muhlfelder, B., Lockhart, J. M., Hansen, W. W., & Cromar, M. W. (1993). A Method for Simulating A Flux-Locked Dc Squid. IEEE Transactions on Applied Superconductivity, 3(1), 1837-1840. https://doi.org/10.1109/77.233324