The prototype of a newly proposed ac-powered Josephson Programmable Logic Array (JPLA) has been fabricated and experimentally investigated. The JPLA can operate more than 10 times as fast as a semiconductor PLA and with one-thousandth of its power dissipation.

A newly developed Josephson logic gate array is described. This gate array has 576 switching devices (Josephson Interferometers) and it has attained the high speed switching time of 33ps with a 2-input OR circuit. Employing and AC-powered latch circuit, the gate array has a single power supply. The total power dissipation of the gate array chip has been estimated to be 2 mW. This gate array includes all the necessary types of function blocks to accommodate any kinds of computer logics. Shift-resistor and 4-bit full-adder circuits have been successfully operated.