A Method for Simulating A Flux-Locked Dc Squid

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

Research output: Contribution to journalLetterpeer-review

2 Scopus citations


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
Issue number1
StatePublished - Mar 1993

All Science Journal Classification (ASJC) codes

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


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