ISSTT Proceedings

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The ALMA Band 6 (211-275 Gliz) Sideband-Separating SIS Mixer-Preamplifier

Authors:
A. R. Kerr, S.-K. Pan, E. F. Lauria, A. W. Lichtenberger, J. Zhang, M. W. Pospieszalski, N. Horner, G. A. Ediss, J. E. Effland, R. L. Groves
Abstract:
The ALMA Band 6 (211-275 GHz) receivers use sideband-separating SIS mixer-preamplifiers with dual 4-12 GHz IF outputs. The sideband-separating mixers are of the phasing type, with the LO driving two component mixers in-phase and the RI signal connected to the mixers through a quadrature hybrid. The IF outputs of the mixers are amplified, then combined in a quadrature hybrid which separates the upper and lower sideband signals. The RI circuit components are all in a single split waveguide block — quadrature hybrid. LO power divider, LO couplers, cold image termination, and the two mixer chips. To achieve the wide IF bandwidth, a low-parasitic mixer is used and the prearnps are bolted directly to the mixer block.
Categories:
SIS Mixers
Year:
2004
Session:
2
Full-text:
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Page Number(s):
55-61