公开(公告)号：DE2535425A1

公开(公告)日：1976-06-24

申请号：DE2535425

申请日：1975-08-08

Applicant: IBM

Inventor： HAMEL HARVEY CHARLES ,  TERLEP KENNETH DICK

IPC: G01R19/165 ,  G11C11/44 ,  H01L39/22 ,  H03K19/195

Abstract: A superconductive sensing circuit having improved signal-to-noise ratio is provided for use with logic circuits using logic switching devices. The sensing circuit includes a first and second branch in parallel wherein the first branch includes a Josephson switching device. The first branch also includes a first inductance and the second branch includes an inductance greater than or equal to the first inductance. The Josephson device in the first branch of the sensing circuit is biased to switch into it's finite voltage state so that the gate current from the logic circuit is directed to the second sensing branch. The Josephson device in the first branch automatically resets to it's no voltage state so that subsequent input current is divided between the two branches inversely proportional to the inductances therein. This subsequent current in the first branch of the sensing circuit is sensed and is indicative of the switching of one or more of the logic devices in the logic circuit.