Operation of Mixer Comprising a Series-Connected Distributed Superconductor-Insulator-Superconductor Junction Array

Mixers comprising series-connected distributed Superconductor-Insulator-Superconductor tunnel junctions (SDJ) are analyzed. Compared to mixers consisting of parallel-connected distributed junctions (PDJ), SDJ mixers offer wider instantaneous bandwidth and higher dynamic range as well as easier magne...

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Bibliographic Details
Published in:IEEE transactions on applied superconductivity 2015-06, Vol.25 (3), p.1-4
Main Authors: Wentao Wu, Jie Liu, Wenlei Shan, Tong, Cheuk-yu Edward
Format: Article
Language:English
Subjects:
Arrays
Convergence
Dynamic range
Fixed-point iteration
Iterative methods
Junctions
Large signal problem
Magnetic fields
Mathematical model
Mixers
Noise
Nonlinear equations
Series-connected distributed junctions
SIS mixer
Superconductivity
Tuning
Tunnel junctions
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Summary:Mixers comprising series-connected distributed Superconductor-Insulator-Superconductor tunnel junctions (SDJ) are analyzed. Compared to mixers consisting of parallel-connected distributed junctions (PDJ), SDJ mixers offer wider instantaneous bandwidth and higher dynamic range as well as easier magnetic field tuning. However, SDJ mixers are more complex in operation and in design as well. The reason lies in the fact that the large-signal nonlinear equations containing 3N unknowns, with N the junction number, are difficult to be solved. We propose a fixed-point iterative method to solve the nonlinear equations. This method is verified to be effective and efficient and a case study is done to clarify the uniqueness of SDJ mixers in operation.
ISSN:1051-8223
1558-2515
DOI:10.1109/TASC.2014.2363012