100 Ghz Sis Mixer With Improved Rf Matching

J. A. Carpenter, A. D. Smith, E. R. Arambula, L. P.S. Lee, T. Nelson, L. Yujiri

Research output: Contribution to journalArticlepeer-review

8 Scopus citations


We have designed and tested a novel superconductor-insulator-superconductor (SIS) mixer coupling scheme with an integrated millimeter-wave transformer. The impedance transformation allows larger junction sizes and easier fabrication than is possible with single junction or array mixers. Experiments with the front-end transformer mixers demonstrated mixer gains up to 10 dB and instantaneous bandwidths of 700 MHz at W-band. In addition to heterodyne mixing, we performed direct detection measurements to measure instantaneous signal bandwidth. Current responsivities of 1000 A/W were measured with a 3 dB bandwidth of 8 GHz. The direct detection performance falls at the quantum limit of one-electron-per-photon to within experimental uncertainty.

Original languageEnglish
Pages (from-to)2654-2657
Number of pages4
JournalIEEE Transactions on Magnetics
Issue number2
StatePublished - Mar 1991


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