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US 5,309,038 AGranted
Superconducting toggle flip-flop circuit and counter circuit
AssigneesResearch Development Corporation of Japan, Yutaka Harada
InventorsYutaka Harada, Hioe Willy
Life of this patent
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Abstract
A high-speed counter capable of counting the number of randomly incoming pulses is constructed by serially connecting a plurality of toggle flip-flop circuits, each of which is activated by input pulses and constructed from an rf-SQUID and the quantum flux parametron, whereby a high-speed computer or a high-speed measurement apparatus can be realised by the use of the high-speed counter.
Claims5
A superconducting toggle flip-flop circuit comprising:
- an rf-SQUID having a Josephson junction and first and second inductors,
- a first winding for supplying magnetic flux to the first inductor of said rf-SQUID, and
- a current amplifier and a third inductor magnetically coupled with the second inductor of said rf-SQUID, said third inductor being operable to detect a circulating current flowing around said rf-SQUID and feed input current to said current amplifier, said current amplifier being operable to transfer an output current through an output line, and a fourth inductor magnetically coupled in an out-of-phase mode with said second inductor of said rf-SQUID and connected to the output line for receiving the output current, the fourth inductor operable to induce a further current of a same direction as the circulating current in the rf-SQUID such that the further current and circulating current together form a further circulating current and the direction of the further circulating current is inverted from the direction of the circulating current.
Dependencies are inferred from the claim text.