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Fast Pulse Circuit using Josephson Junctions

IP.com Disclosure Number: IPCOM000080505D
Original Publication Date: 1973-Dec-01
Included in the Prior Art Database: 2005-Feb-27
Document File: 2 page(s) / 32K

Publishing Venue

IBM

Related People

Klein, M: AUTHOR

Abstract

For an inductive sample and hold circuit for an analog-to-digital converter in a Josephson junction system, and for other purposes in Josephson junction circuits, it is necessary to provide short, fast pulses within the system. The figures show a circuit for generating a single fast pulse.

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Fast Pulse Circuit using Josephson Junctions

For an inductive sample and hold circuit for an analog-to-digital converter in a Josephson junction system, and for other purposes in Josephson junction circuits, it is necessary to provide short, fast pulses within the system. The figures show a circuit for generating a single fast pulse.

In Fig. 1 junctions A and B are switched successively to the voltage state by introducing a delay in a control transmission line 1, which is electrically coupled to junctions A and B. Currents from junctions A and B are combined with opposing polarity in a control conductor portion C, so that the two sequenced step signals produce a pulsed net current, as shown in Fig. 2. Thus, current in the loops associated with junctions A and B are arranged to flow in portion C in opposite directions so that for the time of overlap, cancellation of current occurs, as shown in Fig. 2. Resistors RT in Fig. 1 are terminating resistors. The resulting net current pulse may then be utilized to control a subsequent junction 2.

In the manner just described, pulses of 100 picoseconds duration or less may be generated.

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