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An 84-116 GHz Fixed-Tuned Integrated SIS Mixer-Preamplifier with Ultra-Wide-Band IF and Quantum-Limited Sensitivity

S.-K. Pan, Anthony R. Kerr, M.W. Pospieszalski, E. F. Lauria, W. K. Crady, Nathaniel Horner, Sivasankaran Srikanth, Eric W. Bryerton, C. T. Cunningham, Stephane M. X. Claude, Rey Chin, J. Z. Zhang, A. W. Lichtenberger

Published Jan 1, 2003• 0 citations
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Abstract- This paper describes an 84-116 GHz Nb/Al-oxide/Nb SIS mixer with multi-octave IF bandwidth and quantum-limited sensitivity. The mixer can be integrated with a three-stage 4-12 GHz HFET preamplifier or fitted with a coaxial connector for operation with an external isolator and IF amplifier. An 84-116 GHz receiver using the mixer with an integrated 4-12 GHz HFET preamplifier has a double sideband noise temperature of 16-20 K ( 3 to 4 h</kB) over most of the IF band. Analysis of the mixer-preamp using Tucker=s theory shows good agreement with measurements. The mixer is easy to build and is being used as a building block for the Band 3 sideband-separating receivers for the Atacama Large Millimeter Array (ALMA)**. With minor modifications, this mixer design can be scaled to other ALMA bands. I
An ultra low noise fixed-tuned SIS mixer covering an instantaneous band of 45% around 150 GHz has been developed for radioastronomy. A new type of coplanar tuning circuit for the SIS junction is introduced. The Nb/Al oxide/Nb junctions are 2 /spl mu/m/sup 2/ with critical Josephson current density of 4.2 KA/cm/sup 2/. The minimum DSB mixer noise is 11 K. The minimum DSB receiver noise is 19 K, while the average noise is 25 K in the 130-175 GHz range with a 1 GHz IF band. A speedup of the observations by a factor 2-3 is possible with the new receiver at 30 m IRAM radiotelescope.