A Josephson junction to FET high speed line driver made of TlCaBaCuO

Author

Martens, J.S. ; Ginley, D.S. ; Beyer, J.B. ; Nordman, J.E. ; Hohenwarter, G.K.G.

Author_Institution

Sandia Nat. Lab., Albuquerque, NM, USA

Volume

27

Issue

2

fYear

1991

fDate

3/1/1991 12:00:00 AM

Firstpage

3284

Lastpage

3288

Abstract

A Tl-Ca-Ba-Cu-O superconducting flux flow transistor (SFFT) was used as an active impedance converter between Josephson and FET circuitry. The input of the flux flow device is a control line of low impedance that can be driven by a tunnel junction. The output is the signal across the SFFT which is made of a parallel array of weak links. The output impedance is typically greater than 5 Ω, with a maximum voltage swing of over 100 mV into a 50-Ω system. The switching of an all-Nb junction induced a 90-mV voltage swing at the FET input and over 200 mV at the FET output. The line driver can operate anywhere between 4.2 K and 85 K with minor changes in speed (±5 ps) and output level (±10 mV). The switching time measured was about 100 ps and was fixture limited

Keywords

Josephson effect; barium compounds; calcium compounds; flux flow; high-temperature superconductors; impedance convertors; superconducting junction devices; thallium compounds; 4.2 to 85 K; FET circuitry; Josephson circuitry; TlCaBaCuO; active impedance converter; flux flow device; high speed line driver; high-temperature superconductors; maximum voltage swing; output impedance; output level; parallel array; superconducting flux flow transistor; switching time; tunnel junction; weak links; Control systems; Driver circuits; FETs; High temperature superconductors; Impedance; Josephson junctions; Laboratories; Optical films; Switches; Voltage;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.133914

Filename

133914