Bias-dependence of the thermal time constant in diffusion-cooled superconducting hot-electron bolometer mixers

Wilms Floet, D.; Floet, D. Wilms; Klapwijk, T. M.; Klapwijk, T.M.; Gao, J. R.; Gao, J.R.; de Korte, P. A. J.; de Korte, P.A.J.
September 2000
Applied Physics Letters;9/11/2000, Vol. 77 Issue 11
Academic Journal
We present an experimental study of the intermediate frequency bandwidth of a Nb diffusion-cooled hot-electron bolometer 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 electrothermal feedback through the intermediate frequency circuit is small. The results are understood using a qualitative model, which takes into account the different effective diffusion constants in the normal and superconducting domains. © 2000 American Institute of Physics.


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