Data bus arrangement for josephson tunneling device logic...

Details Data bus arrangement for josephson tunneling device logic... Data bus arrangement for josephson tunneling device logic...

H - Electricity

03

K

328/115, 352/49

H03K 3/38 (2006.01) H03K 17/92 (2006.01) H03K 19/195 (2006.01)

Patent

CA 1079817

DATA BUS ARRANGEMENT FOR JOSEPHSON TUNNELING DEVICE LOGIC INTERCONNECTIONS Abstract of the Disclosure This invention relates generally to data bus arrangements and is more specifically related to data bus arrangements for use with Josephson junction devices. Still more specifically it relates to a star data bus interconnection arrangement whereby a plurality of ports are placed into two-way communication with each other without the generation of spurious, reflected signals. Each of the Josephson devices which is controlled by outputs from a computer or other logic circuit arrangement on an associated control line is supplied from its own constant current source. Each device is effectively placed in parallel with every other device by transmission lines of the same characteristic impedance connected at a node or nodes. The transmission lines which are terminated by a resistance equal to the characteristic impedance of the transmission line absorb incoming signals and prevent the reflection of such signals back to the node or nodes. The number of ports and transmission lines connected to a node is limited only by such practical considerations as the ability of a sensing junction to respond to the magnitude of the current pulse supplied to each transmission line after splitting at the node or nodes. In common with other terminated line Josephson circuits, switching speed in the order of tens of picoseconds are obtainable.

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