ISSTT Proceedings

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A Fixed-Tuned SIS Mixer with Ultra-Wide-Band IF and Quantum-Limited Sensitivity for ALMA Band 3 (84-116 GHz) Receivers

Authors:
S.-K. Pan, A. R. Kerr, M. W. Pospieszalski, E. F. Lauria, W. K. Crady, N. Horner, Jr., S. Srikanth, E. Bryerton, K. Saini, S. M. X. Claude, C. C. Chin, P. Dindo, G. Rodrigues, D. Derdall, J. Z. Zhang, A. W. Lichtenberger
Abstract:
This paper describes an 84-116 GHz Nb/Al-oxideiNb 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 GI-1z 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 hviki,) 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.
Categories:
SIS Mixers
Year:
2004
Session:
2
Full-text:
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Page Number(s):
62-69