MULTI-INPUT JOSEPHSON AND GATE, MULTI-INPUT JOSEPHSON OR GATE, JOSEPHSON DECODER CIRCUIT AND JOSEPHSON PLA CIRCUIT

摘要

PURPOSE: To improve the reliability by connecting quantum interference elements in cascade and giving a bias current to elements of 2nd and succeeding states while being corresponding to the transition to a definite voltage state. ;CONSTITUTION: When transiting to a definite voltage state, Josephson junction elements J₁-J₅ output a voltage corresponding to a gap voltage. Thus, a bias current fed to a quantum interference element S_i corresponding to the element J_i depends definitely on a resistance of a resistor Ri₂. Since the element S_i has only a single input line and a sufficient operating margin is ensured, it is not required to synchronize an input current with the transition caused sequentially from the 1st stage to the final stage and a sufficient time margin for the transition progressed sequentially is obtained. Thus, the multi-input AND gate and the multi-input OR gate with high operation reliability are formed.;COPYRIGHT: (C)1993,JPO&Japio