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Thermal time constant of Nb diffusion-cooled superconducting hot-electron bolometer mixers

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4 Author(s)
D. Wilms Fleet ; Dept. of Appl. Phys., Delft Univ. of Technol., Netherlands ; J. R. Gao ; T. M. Klapwijk ; P. A. J. de Eorte

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 constant 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

Published in:

IEEE Transactions on Applied Superconductivity  (Volume:11 ,  Issue: 1 )