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The dynamics of high-frequency DC RSQUID oscillators

Pegrum, C.M. (2009) The dynamics of high-frequency DC RSQUID oscillators. Superconductor Science and Technology, 22 (6). 064004. ISSN 0953-2048

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Abstract

Josephson circuit simulation software has been used to study the properties of a range of two-junction DC RSQUIDs configured as current-controlled heterodyne oscillators. We find that, if the loop inductance is small, their current-voltage curves are modified substantially due to self-induced Shapiro steps. When the heterodyne frequency is comparable with the Josephson frequency of the junctions the step amplitude becomes very large and additional features are seen, including sub-harmonic steps and step tails. We point out that conventional DC RSQUIDs generally have too large a loop inductance for some of these effects to be seen in the I-V curves, and we suggest that nanofabrication techniques could be used to make novel low-inductance RSQUIDs. We have also demonstrated that by applying a sinusoidally varying RF flux to a DC RSQUID it is possible to phase-modulate the heterodyne oscillation, which could have useful practical applications.

Item type: Article
ID code: 19138
Keywords: superconducting quantum interference devices, SQUIDs, superconducting logic elements, memory devices, microelectronic circuits, Josephson devices, Oscillators, pulse generators, function generators, Physics, Materials Chemistry, Metals and Alloys, Ceramics and Composites, Electrical and Electronic Engineering, Condensed Matter Physics
Subjects: Science > Physics
Department: Faculty of Science > Physics
Related URLs:
    Depositing user: Strathprints Administrator
    Date Deposited: 20 May 2010 20:50
    Last modified: 05 Sep 2014 03:35
    URI: http://strathprints.strath.ac.uk/id/eprint/19138

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