Simulation and measurement of hts josephson heterodyne oscillator

John Cameron MacFarlane, J. Du, R. Taylor, C.M. Pegrum

Research output: Contribution to journalArticle

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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.
Original languageEnglish
Pages (from-to)920-923
Number of pages3
JournalIEEE Transactions on Applied Superconductivity
Volume19
Issue number3
DOIs
Publication statusPublished - 5 Jun 2009

Fingerprint

SQUIDs
shunts
resistors
Resistors
frequency ranges
oscillators
Bias currents
Josephson effect
Linewidth
Josephson junctions
radio frequencies
flexibility
simulation
Single crystals
costs
Fabrication
Crystals
fabrication
output
single crystals

Keywords

  • heterodyne oscillator
  • high-temperature-superconducting
  • Josephson junction

Cite this

MacFarlane, John Cameron ; Du, J. ; Taylor, R. ; Pegrum, C.M. / Simulation and measurement of hts josephson heterodyne oscillator. In: IEEE Transactions on Applied Superconductivity . 2009 ; Vol. 19, No. 3. pp. 920-923.
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Simulation and measurement of hts josephson heterodyne oscillator. / MacFarlane, John Cameron; Du, J.; Taylor, R.; Pegrum, C.M.

In: IEEE Transactions on Applied Superconductivity , Vol. 19, No. 3, 05.06.2009, p. 920-923.

Research output: Contribution to journalArticle

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