Superconductive logic circuit utilizing Josephson tunnelling devices
A logic circuit utilizing Josephson tunnelling devices capable of providing a logical OR or NOR indication in a multi-phase time application is provided. A first current flows through a superconducting circuit having a first and second parallel branch. A plurality of Josephson devices are connected in series in the first branch of the superconductive circuit and a single Josephson device is located in the second branch of the circuit. A control means associated with the single Josephson device is operated at a first phase time for switching the device to its finite voltage state and, accordingly, causing the first current to flow through the first branch of the circuit. Further control means are associated with the plurality of Josephson devices in the first branch to cause one or more of the devices to switch to its finite voltage state at phase two time thereby causing the first current to switch back to the second branch. Output circuit means are associated with each branch of the circuit operable at phase three time for producing an output indicative of the current flow in the branch.
- Assignee:
- International Business Machines Corp.
- Patent Number(s):
- US 3904889
- OSTI ID:
- 5310667
- Country of Publication:
- United States
- Language:
- English
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