Title :
A hot-spot mixer model for phonon-cooled NbN hot electron bolometric mixers
Author :
Merkel, H. ; Khosropanah, P. ; Yagoubov, P. ; Kollberg, E.
Author_Institution :
Dept. of Microwave Electron., Chalmers Univ. of Technol., Goteborg, Sweden
fDate :
6/1/1999 12:00:00 AM
Abstract :
Based on a one dimensional heat transport equation for the electrons in a super-conducting hot electron bolometer (HEB) a model for a hot spot mixer is see up. The hot spot parameters are applied in a small signal oscillator model predicting IV curves and conversion gain. Besides its normal resistance and its IF bandwidth a HEB around its optimal operating point is sufficiently characterized by its hot spot length as a function of heating power. All mixer properties can be derived from this parameter set.
Keywords :
bolometers; hot carriers; niobium compounds; superconducting mixers; I-V characteristics; IF bandwidth; NbN; conversion gain; hot spot mixer model; normal resistance; one-dimensional heat transport equation; phonon cooling; small-signal oscillator; superconducting hot electron bolometer; Bandwidth; Bolometers; Critical current; Electromagnetic heating; Electrons; Equations; Microwave technology; Radio frequency; Resistance heating; Voltage;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
