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Simulation and measurement of hts josephson heterodyne oscillator

MacFarlane, J.C. and Du, J. and Taylor, R. and Pegrum, C.M. (2009) Simulation and measurement of hts josephson heterodyne oscillator. IEEE Transactions on Applied Superconductivity, 19 (3). pp. 920-923. ISSN 1051-8223

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Abstract

We report continuing investigations into practical applications of the ac Josephson effect as the basis for a voltage-tunable radio-frequency oscillator. We have previously demonstrated experimentally that useful power levels (10 s of nW) and linewidths of a few kHz can be achieved in the heterodyne output from a High-Temperature-Superconducting Resistive SQUID (HTS-RSQUID) operating in the frequency range 1-50 MHz. Those results were achieved with 2-junction R-SQUIDs incorporating current-biased shunt resistors of a few micro-ohms. We have now modified the fabrication procedures, and adjusted the shunt resistors and bias current values so that higher frequencies can be achieved. The Josephson junctions are of step-edge type, rather than the bi-crystal type used in our earlier work. The step-edge technique permits much more flexibility in the geometrical lay-out and utilizes the more cost-effective single-crystal MgO substrates. In the present paper, we report numerical simulations and experimental measurements on these devices in the frequency range up to 2 GHz.

Item type: Article
ID code: 19040
Keywords: heterodyne oscillator, high-temperature-superconducting, Josephson junction, Physics, Electronic, Optical and Magnetic Materials, Electrical and Electronic Engineering, Condensed Matter Physics
Subjects: Science > Physics
Department: Faculty of Science > Physics
Faculty of Science > Strathclyde Institute of Pharmacy and Biomedical Sciences
Depositing user: Strathprints Administrator
Date Deposited: 01 Jun 2010 11:03
Last modified: 26 Mar 2015 17:05
URI: http://strathprints.strath.ac.uk/id/eprint/19040

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