ISSTT Proceedings

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Development Of A 480-640 Ghz Tunerless SIS Mixer For First Hifi/Band 1

Authors:
M. Salez, Y. Delorme, I. Péron, F. Dauplay, B. Lecomte, M.-H. Chung, J. Spatazza, M. Guillon, K. Schuster, J.-M. Krieg, A. Deschamps
Abstract:
This paper describes the current work at DEMIRM and IRAM to meet the bandwidth-sensitivity specifications of the HIFI Band 1 instrument (480 – 640 GHz). A specific design philosophy was implemented to optimize this Nb-based SIS mixer. We came to design a new tunerless mixer mount, simplified in terms of fabrication and optmized for a 30% bandwidth. It incorporates a high-efficiency electromagnet which can provide several flux quanta to the junction with less than 10 mA. A novel high current density junction fabrication process was set up at IRAM for this project, using negative resist e-beam lithography. Preliminary results based on Fourier Transform Spectroscopy measurements and heterodyne calibrations are presented and discussed. So far, mixer noise values (corrected for the optics) of respectively 65 K and 140 K were measured with a first batch of junctions with a current density of 10 kA/cm². More recently, with a new batch of higher current density junctions, receiver noise values (double sideband, uncorrected) of 130 K were measured at some frequencies.
Categories:
SIS Mixers
Year:
2001
Session:
1
Full-text:
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Page Number(s):
23-35