ISSTT Proceedings

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Regarding the IF Output Conductance of SIS Tunnel Junctions and the Integration with Cryogenic InP MMIC Amplifiers

Authors:
J. W. Kooi, F. Rice, G. Chattopadhyay, S. Sundarum, S. Weinreb, T. G. Phillips
Abstract:
There is a strong interest in the Submillimeter community to increase the IF bandwidth of SIS receivers in order to facilitate extra-galactic astronomy. However, increasing the IF bandwidth generally also means increasing the IF operating frequency of the mixer, because it is very difficult to achieve a good IF impedance match to a low noise amplifier (LNA) for more than an octave bandwidth. Complicating the matter is that most cryogenic amplifiers do not have a very good input match, which nearly always results in severe standing waves between the mixer and amplifier, especially since the amplifier is connected to the mixer via a finite (10 cm) length of coaxial line. The use of a cryogenic isolator would eliminate the standing wave issue, however all of the currently available cryogenic isolators have less than an octave of bandwidth. The second approach would be to integrated an low noise amplifier into the mixer block, minimizing the distance between the junction and LNA.
Categories:
Mixers, Schottky Devices
Year:
1999
Session:
2
Full-text:
Download a PDF of this paper.
Page Number(s):
100-117