Optimised conversion efficiency of a HTS MMIC Josephson down-converter

J. Du*, D. D. Bai, T. Zhang, Y. Jay Guo, Y. S. He, C. M. Pegrum

*Corresponding author for this work

Research output: Contribution to journalArticle

8 Citations (Scopus)


A high-Tc superconducting (HTS) monolithic microwave integrated circuit (MMIC) Josephson down-converter that approaches zero conversion loss is reported. The all-HTS YBa2Cu3O7-x thin-film circuit consists of a step-edge Josephson junction mixer, a 10-12 GHz bandpass filter for the RF input, a lowpass filter for the IF output and a resonant strip line for local oscillator isolation; all are integrated on a single 10 mm × 20 mm MgO substrate. The DC characteristics of the junction and its mixing properties have been experimentally studied and compared to the results of (a) a single Josephson mixer without the on-chip HTS filters, and (b) our previously reported MMIC down-converter which had very different junction characteristics. The Josephson junction parameters are analysed to give insight into their effect on the mixer performance.

Original languageEnglish
Article number105002
Pages (from-to)1-8
Number of pages8
JournalSuperconductor Science and Technology
Issue number10
Publication statusPublished - 1 Oct 2014
Externally publishedYes


  • conversion efficiency
  • high-temperature superconductor
  • Josephson junction mixer
  • monolithic microwave integrated circuit

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