The effect of the quantum susceptance on the gain of superconducting quasiparticle mixers

Author

Mears, C.A. ; Hu, Qing ; Richards, P.L.

Author_Institution

Dept. of Phys., California Univ., Berkeley, CA, USA

Volume

27

Issue

2

fYear

1991

fDate

3/1/1991 12:00:00 AM

Firstpage

3384

Lastpage

3387

Abstract

A detailed analysis of the effects of the quantum susceptance on the performance of superconductor-insulator-superconductor (SIS) mixers is performed. It is found that the principal effects of the quantum susceptance are to change the DC bias at which optimum coupling of the signal to the mixer occurs, and to change the output admittance at the IF frequency, thus changing the available gain. It is shown that at the signal port the principal effect is to change the bias voltage at which optimum coupling to the mixer occurs. A more dramatic effect occurs at the IF port, where the quantum susceptance leads to negative values of the output conductance, which causes the available gain to be infinite

Keywords

electric admittance; mixers (circuits); solid-state microwave circuits; superconducting junction devices; DC bias; IF frequency; IF port; SIS mixers; bias voltage; negative values; optimum coupling; output admittance; output conductance; quantum susceptance; superconducting quasiparticle mixers; superconductor-insulator-superconductor; Admittance; Chemical analysis; Frequency; Hafnium; Millimeter wave measurements; Performance analysis; Quantum mechanics; Superconducting devices; Superconducting materials; Voltage;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.133938

Filename

133938