Browse Prior Art Database

Josephson Device Level Converter

IP.com Disclosure Number: IPCOM000079052D
Original Publication Date: 1973-Apr-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 2 page(s) / 32K

Publishing Venue

IBM

Related People

Hamel, HC: AUTHOR

Abstract

The circuits converts a unipolar current signal I(IN) to a bipolar current signal IB2. Two Josephson devices J1 and J2, as shown in Fig. 1A, are utilized, each differently biased so as to switch at different predetermined levels. The timing pulses are provided by IS as indicated in Fig. 1C. The current I(IN) has two levels, O and I1. When I(IN) is O, device J1 will switch but J2 will not. This is represented by point P2 in Fig. 1B.

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Josephson Device Level Converter

The circuits converts a unipolar current signal I(IN) to a bipolar current signal IB2. Two Josephson devices J1 and J2, as shown in Fig. 1A, are utilized, each differently biased so as to switch at different predetermined levels. The timing pulses are provided by IS as indicated in Fig. 1C. The current I(IN) has two levels, O and I1. When I(IN) is O, device J1 will switch but J2 will not. This is represented by point P2 in Fig. 1B.

Referring to Fig. 1C, it can be seen that output current IB2 is positive when the current I(IN) is O. When I(IN) is equal to I1, device J2 will switch as can be seen from point P2 in Fig. 1B. The current output IB2 will be of negative polarity, as can be seen from Fig. 1C.

The appropriate timing in the circuit is shown in Fig. 1C. The desired output current is in the middle branch of the circuit labelled IB2. It can be seen from the circuit of Fig. 1 that:

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