Title :
100 GHz SIS mixer with improved RF matching
Author :
Carpenter, J.A. ; Smith, A.D. ; Arambula, E.R. ; Lee, L.P.S. ; Nelson, T. ; Yujiri, L.
Author_Institution :
TRW, Redondo Beach, CA, USA
fDate :
3/1/1991 12:00:00 AM
Abstract :
A novel superconductor-insulator-superconductor (SIS) mixer coupling scheme with an integrated millimeter-wave transformer has been designed and tested. 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, direct detection measurements were made 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 to within experimental uncertainty at the quantum limit of one-electron-per-photon
Keywords :
impedance matching; mixers (circuits); solid-state microwave devices; superconducting junction devices; 10 dB; 100 GHz; 700 MHz; 8 GHz; EHF; RF matching; SIS mixer; W-band; bandwidths; direct detection measurements; direct detection performance; easier fabrication; front-end transformer mixers; heterodyne mixing; impedance transformation; integrated millimeter-wave transformer; larger junction sizes; mixer coupling scheme; mixer gains; quantum limit; responsivities; superconductor-insulator-superconductor; Bandwidth; Circuit faults; Circuit optimization; Electrodes; Impedance; Microstrip; Parasitic capacitance; Power transmission lines; Radio frequency; Waveguide junctions;
Journal_Title :
Magnetics, IEEE Transactions on
