ISSTT Proceedings

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An Active Zone Small Signal Model for Hot Electron Bolometric Mixers

Authors:
Harald F. Merkel, Pourya Khosropanah, K. Sigfrid Yngvesson, Serguei Cherednichenko, Matthias Kroug, Auréle Adam, Erik L. Kollberg
Abstract:
In this paper, the influence of contact resistance between the NbN film and the Au pads on the formation of a hot spot in superconducting hot electron bolometers (HEB) is discussed. Based on a one-dimensional heat transport equation for electrons and phonons for the steady state, a distributed small signal model is derived. One finds that the mixing is limited to a small portion of the HEB, where the derivative of the resistivity with temperature is significantly nonzero. It is this small active zone which yields the electrothermal feedback term, not the whole device resistance as in traditional small signal models. Predicted IF bandwidth, receiver noise and conversion gain coincide very well with experimental findings.
Categories:
HEB Mixers
Year:
2001
Session:
2
Full-text:
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Page Number(s):
55-61