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A method for simulating a flux-locked DC SQUID

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6 Author(s)
Gutt, G.M. ; W.W. Hansen Exp. Phys. Lab., Stanford, CA, USA ; Kasdin, N.J. ; Condron, M.R., II ; Muhlfelder, B.
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The authors describe a computationally efficient and accurate method for simulating a DC superconducting quantum interference device's (SQUID's) V- phi (voltage-flux) and I-V characteristics which 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- Phi 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. The authors 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.<>

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Applied Superconductivity, IEEE Transactions on  (Volume:3 ,  Issue: 1 )