Rapid single-flux-quantum logic circuit and rapid single-flux-quantum output conversion circuit

A rapid single-flux-quantum RSFQ output voltage converter including a plurality of RSFQ logic circuits, each RSFQ logic circuit comprising:

• a first circuit portion having a first end grounded and having a first Josephson junction and a second Josephson junction which are connected in series;
• a second circuit portion having a first end grounded and having a third Josephson junction and a fourth Josephson junction which are connected in series;
• a first inductance element connecting a second end of the first circuit portion to a second end of the second circuit portion;
• a tap provided in the first inductance element, an input current signal being supplied to the tap;
• a bias current source connected to a first connection node between the first Josephson junction and the second Josephson junction;
• a second inductance element connecting the first connection node to a second connection node between the third Josephson junction and the fourth Josephson junction;
• and
• a superconducting quantum interference device having a fifth Josephson junction and a sixth Josephson junction and being coupled to the second inductance element through a magnetic field,
• wherein the respective superconducting quantum interference devices of the plurality of RSFQ logic circuits are connected in series.