A method for simulating a flux-locked DC SQUID

• Published in: IEEE transactions on applied superconductivity Vol. 3; no. 1; pp. 1837 - 1840
• Main Authors: Gutt, G.M., Kasdin, N.J., Condron, M.R., Muhlfelder, B., Lockhart, J.M., Cromar, M.W.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Legacy CDMS IEEE 01-03-1993; Institute of Electrical and Electronics Engineers
• Subjects: Applied sciences; Computational modeling; Curve fitting; Electronics; Electronics And Electrical Engineering; Exact sciences and technology; Fourier transforms; Interference; Predictive models; Quantum computing; Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices; SPICE; SQUIDs; Superconducting devices; Voltage; Computer simulation; Feedback system; Superconducting quantum interferometer device
• ISSN: 1051-8223; 1558-2515
• DOI: 10.1109/77.233324

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.< >