Experimental realization of a resistive single flux quantum logic circuit

Author

Koshelets, V.P. ; Likharev, K.K. ; Migulin, V.V. ; Mukhanov, O.A. ; Ovsyannikov, G.A. ; Semenov, V.K. ; Serpuchenko, I.L. ; Vystavkin, A.N.

Author_Institution

Institute of Radio Engineering and Electronics, Moscow, USSR

Volume

23

Issue

2

fYear

1987

fDate

3/1/1987 12:00:00 AM

Firstpage

755

Lastpage

758

Abstract

An integrated circuit including all basic components of the recently suggested Resistive Single Flux Quantum (RSFQ) logic family has been designed, fabricated and tested successfully. The circuit includes a generator of periodic SFQ pulses, four buffer/amplifier stages for splitting, channeling and regeneration of the pulses, a detector/load stage, and universal RSFQ logic gate (here performing the NOT function). The 10μm design rule circuit employs 13 active Nb - Al2O3- Nb Josephson junctions with the critical current density ∼ 0.5 kA/cm². externally shunted by Mo resistors with R 1 Ohm. The shunting provided critical damping of the junctions ( $\\beta _{c}l\\sim 1$ ) and reasonable ( $\\sim 500 \\mu$ V) IcR product. The circuit operation has been tested by measurement of dc voltages $\\bar{V}_{i}$ across various Josephson junctions as functions of the dc current through the pulse generator. Correct and stable operation of the circuit for the clock frequencies from 0 to ∼30 GHz has been demonstrated.

Keywords

Josephson device logic; Circuit testing; Josephson junctions; Logic circuits; Logic design; Logic testing; Niobium; Pulse amplifiers; Pulse circuits; Pulse generation; Pulse measurements;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.1987.1064953

Filename

1064953