ISSTT Proceedings

ISSTT Proceedings

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Embedding the Quantum Mixer Theory into a Time Domain Field Solver

Authors:
Douglas W. Henke, Poman P. M. So, Stéphane M. X. Claude, Wolfgang J. R. Hoefer
Abstract:
To completely account for the quantum-mechanical features of the superconductor-insulator-superconductor (SIS) junction, Tucker’s quantum mixer theory must be used. The standard approach is to perform the computations in the frequency domain. To determine the large signal waveform resulting across the junction, a time domain formulation has also been used in the voltage update method (VUM). Even using this method, the nonlinear diode current (computed using the time domain equations) is related to the rest of the circuit in the Fourier domain. An iterative procedure enables the correct junction voltage to be found. This paper proposes a variation to the VUM such that all calculations are performed in the time domain, in a time-stepping fashion, enabling the theory to be implemented into a time domain field solver. The main advantages of performing simulations within the time domain are the ability to process arbitrary time signals applied to the nonlinear junction and to generate complete information on the mixing products over a wide frequency range. It is recognized that a noise analysis is not feasible within the time domain and would be treated separately.
Categories:
SIS
Year:
2005
Session:
3
Full-text:
Download a PDF of this paper.
Page Number(s):
27-32