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arXiv:0801.4886 · Physica C Superconductivity

The dynamically asymmetric SQUID: Münchhausen effect

A. U. Thomann, V. B. Geshkenbeǐn, G. Blatter

Published Mar 3, 2008• 1 citation
arXivHTMLPDF
DOI
10.1016/j.physc.2007.11.034

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The relationship between superconducting quantum interference device (SQUID) voltage swing and additional positive feedback (APF) parameters has been investigated. Voltage swing is depressed as APF gain increases. In a symmetric-bias-injection SQUID, the voltage depression can be explained by the voltage divider action of APF resistance and the SQUID dynamic resistance. On the other hand, the voltage depression in an asymmetric-bias-injection SQUID is expressed as the effect of the voltage divider action multiplied by the effect of thermal noise of APF resistance. These two effects should be considered when designing SQUIDs with an APF.