Non-linear two-frequency analysis of SIS mixers through harmonic balance

Details Non-linear two-frequency analysis of SIS mixers through harmonic balance Non-linear two-frequency analysis of SIS mixers through harmonic balance

May 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002jphy4..12..165w&link_type=abstract

Journal de Physique IV (Proceedings), Volume 12, Issue 3, May 2002, pp.165-168

Computer Science

Performance

Scientific paper

We present a numerical procedure for simulating the non-linear behaviour of Superconductor-InsulatorSuperconductor (SIS) tunnel junction mixers. Mixers of this kind are used extensively in high-performance submillimetre-wave astronomical receivers. The procedure is complete in that both the signal and local-oscillator voltages can be at high levels, with significant amounts of harmonic content; also, the full quantum mechanical behaviour of the tunnel junction is taken into account. The initial simulations show that multi-tone analysis can be carried out in a numerically efficient manner, and that saturation, and the attendant generation of IF harmonics, can be modelled rigorously. This work constitutes the first full non-linear model of an SIS mixer, and the theoretical and numerical procedures described, will be of great importance when designing the next generation of heterodyne astronomical receivers.

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