Multitone quantum simulations of saturating tunnel junction mixers

Details Multitone quantum simulations of saturating tunnel junction mixers Multitone quantum simulations of saturating tunnel junction mixers

Jun 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003jap....93.9812w&link_type=abstract

Journal of Applied Physics, Volume 93, Issue 12, pp. 9812-9822 (2003).

Physics

3

Modulators And Demodulators, Discriminators, Comparators, Mixers, Limiters, And Compressors, Josephson Devices, Microwave Circuits, Radio Telescopes And Instrumentation, Heterodyne Receivers, Circuit Theory

Scientific paper

When designing instruments for submillimeter-wave astronomy it is important to understand precisely how saturating superconducting tunnel-junction mixers behave. In this article, a procedure is described for calculating the behavior of tunnel-junction circuits when multitone high-level signals are applied. The procedure is based on a full quantum-mechanical description of photon-assisted tunneling, and uses Harmonic Newton to search for a set of voltages and currents that satisfy the circuit equations at every frequency present. A number of illustrative simulations are presented, and it is shown that Harmonic Newton can be used to model saturating superconductor-insulator-superconductor mixers in a robust and numerically efficient manner.

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