Patent ID: 7227480

Claim:
A current steering type single flux quantum circuit comprising: a pair of junctions constituted of two Josephson junctions that are connected in series to each other; a circuit for grounding one end of the pair of junctions; a bias current supply which has one end which is grounded and the other end which is connected to the other end of the pair of junctions; a series circuit formed of a first inductor and a third Josephson junction, said series circuit being connected between the ground and a node between the pair of junctions and the bias current supply; and a second inductor that is magnetically coupled to the first inductor; wherein an analog signal to-be-compared current is inputted into a node between the two Josephson junctions constituting the pair of junctions, and when an electric current flowing into the first inductor exceeds a specified threshold value as a result of being induced by a current signal flowing into the second inductor, if said analog signal to-be-compared current exceeds a specified threshold value, a single flux quantum signal is output from the node between the two Josephson junctions constituting the pair of junctions.