Title :
Conversion gain and fluctuation noise of phonon-cooled hot-electron bolometers in hot-spot regime
Author :
Merkel, Harald F. ; Khosropanah, Pourya ; Floet, Danny Wilms ; Yagoubov, Pavel A. ; Kollberg, Erik L.
Author_Institution :
Dept. of Microwave Electron., Chalmers Univ. of Technol., Goteborg, Sweden
fDate :
4/1/2000 12:00:00 AM
Abstract :
In this paper, a one-dimensional heat balance model for the hot-spot length of phonon-cooled hot-electron bolometer is set up and solved for the electron temperature profile along the bolometer bridge. A self-consistent theoretical method is presented to obtain the hot-spot length profile as a function of RF and bias heating power. This result is used to predict current-voltage characteristics. For a known hot-spot length profile, a small-signal model with different heating efficiencies for RP and bias heating is derived in the vicinity of an operating point. This small-signal model allows the conversion gain and fluctuation noise contribution to be calculated
Keywords :
bolometers; hot carriers; superconducting device noise; conversion gain; current-voltage characteristics; electron temperature profile; fluctuation noise; hot-spot; one-dimensional heat balance model; phonon cooling; small-signal model; superconducting hot-electron bolometer; Bolometers; Electrical resistance measurement; Electrons; Fluctuations; Heating; Phonons; Radio frequency; Superconducting device noise; Superconducting microwave devices; Temperature;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
