| 摘要 |
PURPOSE:To operate a logical gate circuit of the product at a high spped, by supplying a current to 2 Josephson junctions and 3 resistances, respectively, from 2 input lines, and fetching an output from the Josephson junction connected to a connecting point of the resistance. CONSTITUTION:To a Josephson JS junction 30 whose one terminal has been grounded 40, an input line 38 for injecting an input current Ia, and resistances 33, 34 are connected, and to the other terminal of the resistance 33, a JS junction 31 whose one terminal has been grounded, an output line 36 terminated by a load resistance 37, and a resistance 35 are connected. To the other terminals of the resistances 34, 35, a JS junction 32 whose one terminal has been grounded 40, and an input line 39 for injecting a current Ib are connected. The transition current values I01, I02 and I<03> of the JS junctions 30-32 are set to I01=I03=I02/2=I0, and the resistance values r1, r2 and r3 of the resistance 33-35 are set to r1=r3=r2/2. In a state that only one current in the currents Ia, Ib flows, the logical gate is not transferred to a voltage state unless a current exceeding 3Io flows. In case of exceeding a curent Ia=Ib=Io, the logical gate circuit is transferred to the voltage state, has a wide operation margin and high gain, and executes its operation at a high speed. |
