| 摘要 |
PURPOSE:To detect the down edge of a current flowed to a primary winding of a transformer by changing the state of a resistance coupled OR circuit consisting of a resistance and a Josephson device when this current is reduced to zero. CONSTITUTION:If the input signal current flowed to the primary winding of a transformer 101 is increased from zero in the direction of an arrow 121, a Josephson device 103 in a resistance coupled Josephson down edge detecting circuit is switched to the resistance state when the primary current induced in the secondary winding in the direction of an arrow 122 reaches a threshold, and the current of the secondary winding of the transformer 101 is attenuated; and if the input signal current is reduced to zero from a regulated value or a maximum value, the device 103 is switched to the resistance zero state and is held in this state to switch a resistance coupled OR circuit 102. When Josephson devices 203 and 204 in an RCJL-type OR circuit 201 are switched to the resistance state as resistance coupling, the Josephson device 201 is switched to the resistance state, and output signals appear in output terminals 109 and 110. The secondary current of the transformer 101 is attenuated to zero by a closed circuit consisting of resistances 104 and 205 and the Josephson device 103. |
