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Sequential Switch using Josephson Junctions

IP.com Disclosure Number: IPCOM000080504D
Original Publication Date: 1973-Dec-01
Included in the Prior Art Database: 2005-Feb-27
Document File: 2 page(s) / 26K

Publishing Venue

IBM

Related People

Klein, M: AUTHOR

Abstract

Where it is required, in analog to digital converter arrangements, to close a set of switches in time sequence, it may be desirable to operate such switches under the control of the system clock. Clock control relieves design constraints and permits operating speeds to be chosen, which are consistent with Josephson junction device capabilities. Although the present approach is to provide a means for sequential switching in analog to digital circuits, it is likely that sequential switching will be required for other system control applications as well.

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Sequential Switch using Josephson Junctions

Where it is required, in analog to digital converter arrangements, to close a set of switches in time sequence, it may be desirable to operate such switches under the control of the system clock. Clock control relieves design constraints and permits operating speeds to be chosen, which are consistent with Josephson junction device capabilities. Although the present approach is to provide a means for sequential switching in analog to digital circuits, it is likely that sequential switching will be required for other system control applications as well.

The figure shows a sequential switch and the associated pulse patterns which actuate it. A start signal applied at START together with a C1 pulse, switches junction 1 to the voltage state. The resulting current I1 together with the current R Which flows through junction 2 switches junction 2. R is a DC supply with a reset capability. Junction 3 does not switch immediately as a result of the presence of current I2, because the C2 signal has not yet been applied. When a C2 pulse is applied, junction 3 switches.

The process just described propagates down a chain of the devices connected in a manner similar to that shown. Devices S1 and S2 are switched in sequence when currents I2 and I4 appear in their associated loops. Circuits connected to S1 and S2 are thus operated sequentially. It should be noted that although separate lines C1 are shown, in practice all the junctions sh...