Browse Prior Art Database

Magnetically Coupled Buffered Nonlinear Split and Gate

IP.com Disclosure Number: IPCOM000045550D
Original Publication Date: 1983-Apr-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 2 page(s) / 28K

Publishing Venue

IBM

Related People

Anderson, CJ: AUTHOR

Abstract

Magnetically coupling branched Josephson junction buffers, with resulting improved margins, and connecting a pair of magnetically coupled buffers to a resistive split AND gate, achieves a nonlinear AND function in low temperature technology.

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Magnetically Coupled Buffered Nonlinear Split and Gate

Magnetically coupling branched Josephson junction buffers, with resulting improved margins, and connecting a pair of magnetically coupled buffers to a resistive split AND gate, achieves a nonlinear AND function in low temperature technology.

The Josephson junction buffered resistive split AND gate is shown in the figure, where I(A) and I(B) are inputs and n is an integer. The inductances in the magnetically coupled buffers are chosen so that the minimum input current switches the buffer but does not put the buffer into the 1 lobe. Men input I(A) is present, buffer A switches and the current splits equally to buffer B and the output junction (for R(A) = R(B) = R(0)). The current going to the output junction ideally is I(A)/2. The current coming into buffer B from R(B) requires a higher value to switch the buffer than current injected in I(A). When I(B) is injected the buffer B switches and I(A) + I(B) goes to the output junction. The amplification of the current to the output junction is a factor of 4 for going from 1 input to 2 inputs. By varying the resistors and junctions, higher values of amplification are possible. The buffered resistive split AND only uses the 0 lobe of the buffer and has a potential for good margins.

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