[asac][almanews] ALMA Memo 498 Released

[Stacy Oliver]

ALMA MEMO #498 

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


A. R. Kerr (1), S.-K. Pan (1), E. F. Lauria (1), A. W. Lichtenberger(2),

J. Zhang (2), M. W. Pospieszalski (1), N. Horner (1), G. A. Ediss (1),
J. E. Effland, (1), R. L. Groves (1) 

1 National Radio Astronomy Observatory Charlottesville, VA 22903
2 The University of Virginia, Charlottesville, VA 22904

2004-05-14 

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 RF 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 RF 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 preamps are bolted
directly to the mixer block. 

View a pdf version of ALMA Memo #498. 
http://www.alma.nrao.edu/memos/html-memos/alma498/memo498.pdf


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