4 November 2010 Sideband separating mixer for 600-720 GHz
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The ALMA Band 9 receiver cartridge (600-720 GHz) based on Dual Sideband (DSB) superconductor-insulatorsuperconductor (SIS) mixer is currently in full production. In the case of spectral line observations, the integration time to reach a certain signal-to-noise level can be reduced by about a factor of two by rejecting an unused sideband. The goal is to upgrade the current ALMA band 9 cartridge to a full dual-polarization sideband separating (2SB) capability, with minimal-cost upgrade path. A new compact and modular sideband separating mixer was designed, and a prototype manufactured. The individual SIS mixer devices in the 2SB block are implemented as conventional Band 9 DSB mixers, so that existing devices can be reused and tested individually. Any ALMA DSB developments contribute to the 2SB upgrade. The first experimental results demonstrate noise temperature from 300K to 500K over 80% of the band, which will be improved to fit the ALMA requirements. Nevertheless, the frequency response for 2SB is the same as for DSB, showing that the RF design is still valid, even with different SIS mixer devices. The quality of the RF and IF design is confirmed by a sideband rejection ratio of about 15 dB, which is within the ALMA spec (>10dB ).
© (2010) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Andrey Khudchenko, Andrey Khudchenko, Ronald Hesper, Ronald Hesper, Andrey Baryshev, Andrey Baryshev, Gerrit Gerlofma, Gerrit Gerlofma, Patricio Mena, Patricio Mena, Tony Zijlstra, Tony Zijlstra, Teun Klapwijk, Teun Klapwijk, Marco Spaans, Marco Spaans, Jacob W. Kooi, Jacob W. Kooi, } "Sideband separating mixer for 600-720 GHz", Proc. SPIE 7854, Infrared, Millimeter Wave, and Terahertz Technologies, 78542R (4 November 2010); doi: 10.1117/12.869594; https://doi.org/10.1117/12.869594

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