Tightly coupled dc SQUIDs with resonance damping

• Published in: IEEE transactions on applied superconductivity Vol. 7; no. 2; pp. 2538 - 2541
• Main Authors: Ono, R.H., Koch, J.A., Steinbach, A., Huber, M.E., Cromar, M.W.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: New York, NY IEEE 01-06-1997; Institute of Electrical and Electronics Engineers
• Subjects: Applied sciences; Coils; Coupled mode analysis; Coupling circuits; Damping; Degradation; Electronics; Exact sciences and technology; Resistors; Resonance; RLC circuits; Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices; SQUIDs; Superconducting devices; Transformers
• ISSN: 1051-8223; 1558-2515
• DOI: 10.1109/77.621756

We have reduced the effect of resonances on washer style dc SQUIDs coupled to input flux transformers and analyzed our damping structures using a distributed circuit model. A resistance of 1/spl Omega/ is placed across each turn of a 137-turn coil coupled to a planar washer dc SQUID reducing the structure in the voltage-flux curve thus extending the range of current biases over which the device operates. The energy sensitivity of the SQUID is predicted to not be degraded by the intracoil resistors.