COMPLEMENTARY JOSEPHSON-JUNCTION DEVICES AND CIRCUITS - A POSSIBLE NEW APPROACH TO SUPERCONDUCTING ELECTRONICS

We present a superconducting logic family whose operation relies on th e availability of a current gain greater than one, based on the analog y to semiconductor complementary metal-oxide-semiconductor (CMOS) legi t family. The Complementary Josephson Junction (CJJ) logic family util izes two types of nonlatching devices: a conventional device and a com plementary device. The conventional device has a finite critical curre nt, and the complementary device has zero critical current with no inp ut applied. When the input is high, the complementary device has a fin ite critical current, while the conventional device has zero critical current. The bias current can be steered between a branch with a compl ementary device and a branch with a conventional device performing log ic (and memory) functions. We can also use a resistor as a load to a c omplementary device, We call this circuit topology the Resistor Comple mentary Josephson Junction (RCJJ) family, It is analogous to the semic onductor PMOS/resistor logic family. In this paper, we investigate met hods of realizing complementary devices, and we present a preliminary analysis of speed, margins, and power dissipation in simple CJJ and RC JJ inverter circuits.