Browse Prior Art Database

Soliton Personalization

IP.com Disclosure Number: IPCOM000045150D
Original Publication Date: 1983-Feb-01
Included in the Prior Art Database: 2005-Feb-06
Document File: 2 page(s) / 40K

Publishing Venue

IBM

Related People

Faris, SM: AUTHOR [+2]

Abstract

Laser scribing of unwanted portions of a "don't care" Josephson soliton resistor network provides a flexible array, requiring no complement inputs, in which the (AND and NOR) functions can be determined at the time of personalization.

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Soliton Personalization

Laser scribing of unwanted portions of a "don't care" Josephson soliton resistor network provides a flexible array, requiring no complement inputs, in which the (AND and NOR) functions can be determined at the time of personalization.

The forked soliton device initially has four resistors, including a connecting resistor and a terminating resistor connected at the output of each tine. During personalization, a highpowered dye laser is focused (with spotsize approx. 5 Mum) on each resistor which is not needed in the final design. In general, one removes a connecting resistor on one of the forks, and also removes the terminating resistor on the other tine. With this personalization, the soliton will be lost at the terminating resistor on the bottom tine unless a control signal is present to force the soliton to the tine with the connecting resistor. This is the AND function.

It should be noted that one may obtain the NOR function by reversing the roles of the connecting and terminating resistors, so that terms such as A-B-C become A-B-C equals (A+B+C).

One should fabricate resistors of a much lower melting point than the metallization near or under the laser focal point. One such combination would be a Au In(2) resistor atop SiO insulation which lies on a Nb base electrode film.

The implementation of two lines of an AND array are shown in the figure. The first row has all devices personalized the same way, yielding A-B-C-D. The second device...