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

Volume

48

Issue

4

fYear

2000

fDate

4/1/2000 12:00:00 AM

Firstpage

690

Lastpage

699

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;

fLanguage

English

Journal_Title

Microwave Theory and Techniques, IEEE Transactions on

Publisher

ieee

ISSN

0018-9480

Type

jour

DOI

10.1109/22.841961

Filename

841961