ISSTT Proceedings

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Bias Dependence of the Thermal Time Constant in Nb Superconducting Diffusion-Cooled HEB Mixers

Authors:
D. Wilms Floet, J.R. Gao, T.M. Klapwijk, P.A.J. de Korte
Abstract:
In this paper, we present an experimental study of the intermediate frequency bandwidth of a Nb diffusion cooled hot electron bolorneter mixer for different bias voltages. The measurements show that the bandwidth increases with increasing voltage. Analysis of the data reveals that this effect is mainly caused by a decrease of the intrinsic thermal time of the mixer and that the effect of electro-thermal feedback through the intermediate frequency circuit is small. The results are explained using a qualitative model, in which the time constant is calculated using a weighted average of the diffusion constant as a function of the relative length of the hotspot, and accounting for the lower diffusion constant in the superconducting domain. Thus, we show that for a diffusion cooled hot-electron bolometer, the intermediate frequency bandwidth is determined not only by the length of the microbridge, as is generally believed, but also by the length of the electronic hotspot.
Categories:
Poster Session
Year:
2000
Session:
7
Full-text:
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Page Number(s):
446-455