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Numerical Modeling of the Quasiparticle Non-Linear Transmission Line

Authors:
C. -Y. Edward Tong, Linda Chen, Raymond Blundell
Abstract:
An analysis is presented for the behavior of the quasiparticle non-linear transmission line driven by a high frequency local oscillator. The theory developed includes a large-signal non-linear analysis, a small-signal analysis and a noise analysis. This model is used to simulate the conversion loss and noise temperature of distributed quasiparticle mixers based on the non-linear transmission line. The numerical code has been verified by comparing the theoretical conversion loss and mixer noise temperature with that of an experimental mixer that operates in the 400 GHz band. Reasonable agreement between the calculated and measured data has been obtained. The numerical simulation shows that good conversion efficency and low mixer noise temperature are realizable at relatively low source resistance where the optimum line lengths are spaced half guided wavelength apart. From the results of the daculation, one can also derive the optimum critical current density of the long SIS junctions used for this type of non-linear transmission line based SIS mixer.
Categories:
SIS
Year:
1997
Session:
2
Full-text:
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Page Number(s):
91