Pegrum, C.M. (2009) The dynamics of high-frequency DC RSQUID oscillators. Superconductor Science and Technology, 22 (6). 064004. ISSN 0953-2048Full text not available in this repository. (Request a copy from the Strathclyde author)
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.
|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|
|Depositing user:||Strathprints Administrator|
|Date Deposited:||20 May 2010 19:50|
|Last modified:||06 Jan 2017 07:54|