Browse Prior Art Database

3 Phase Shift Register

IP.com Disclosure Number: IPCOM000079114D
Original Publication Date: 1973-May-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 2 page(s) / 35K

Publishing Venue

IBM

Related People

Hamel, HC: AUTHOR [+2]

Abstract

Fig. 1 shows a schematic diagram of a shift register using a Josephson device in each stage. The timing for the 3-phase shift register is shown in Fig. 2. The Josephson device D in each stage of the shift register is biased such that when the phase input and the data input control line both have currents flowing therein simultaneously, the device switches from the superconducting to the resistive (nonsuperconducting) state. Assuming a data input of "1", that is, a current flowing in the data-in line, activation of the phase 1 current source causes device D1 to switch, thus forcing part of the current to flow through R1 in the steady state.

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3 Phase Shift Register

Fig. 1 shows a schematic diagram of a shift register using a Josephson device in each stage. The timing for the 3-phase shift register is shown in Fig. 2. The Josephson device D in each stage of the shift register is biased such that when the phase input and the data input control line both have currents flowing therein simultaneously, the device switches from the superconducting to the resistive (nonsuperconducting) state. Assuming a data input of "1", that is, a current flowing in the data-in line, activation of the phase 1 current source causes device D1 to switch, thus forcing part of the current to flow through R1 in the steady state.

When timing inputs Phi 2 and Phi 3 are activated, similarly the current will flow through R2 and R3, respectively, in the steady state. The line containing the resistors R1, etc form the control input to the Josephson of the next stage, as indicated by the line with the arrow pointing to the next Josephson device. This arrangement can be used for either an open-ended or closed-loop shift register. Any residual energy in each stage will be dissipated in the resistors R1, R2, etc.

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