Abstract
Using Tucker's quantum theory of mixing and a quasi five-frequency approximation proposed by Kerr et al., this paper explores the optimum operating conditions of SIS mixers in the frequency region of 100 to 650 GHz. Four parameters (i.e., ΩRnCj product, normal state resistance Rn, RF source admittance (Rrf−+jB), and IF load resistance Rif) affecting the performance of an SIS mixer have been investigated. Our results indicate that, independent of the absolute value of Rn, the SIS mixer performance is dominated by Rrf/Rn and Rif/Rn; and that the mixer performance becomes quite insensitive to the ΩRnCj product, as the mixer operating frequency goes up to submillimeter wavelengths. Concerning all properties of an SIS mixer, the optimum Rrf/Rn value seems proportional to f1/n (n≈2), and the optimum Rif/Rn and jB/Gn values are relatively independent of frequency, about 0.5 to 1.5 and −j0.5 to −j1.0 respectively.
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