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Sub-Millimeter Distributed Quasiparticle Receiver Employing A Non-Linear Transmission Line

Authors:
Cheuk-yu Edward Tong, Raymond Blundell, Bruce Bumble, Jeffrey A. Stern, Henry G. LeDuc
Abstract:
The non-linear quasiparticle current flowing in a superconductor-insulator-superconductor (SIS) transmission line has successfully been used in low-noise heterodyne receivers at sub-millimeter wavelengths. These distributed mixer receivers have been implemented in both the 400 and the 600 GHz frequency bands and double-side-band receiver noise temperatures of 66 K at 455 GHz and 210 K at 630 GHz have been measured. Such performance is comparable to, or slightly better than the corresponding lumped element SIS mixerreceivers. The transmission lines used are fabricated from Nb/Al/A10x/Nb trilayer material, and are typrically 200 nm wide and 1-2 [lambda]g long. The distributed mixer chips have been designed with a simple linear model. We present design rules derived from this model and discuss some difficulties in mixer implementation.
Categories:
SIS Mixers
Year:
1996
Session:
1
Full-text:
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Page Number(s):
47-62