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# Bubble Domain Residue Threshold Logic Device

IP.com Disclosure Number: IPCOM000082741D
Original Publication Date: 1975-Jan-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 2 page(s) / 28K

IBM

## Related People

Chen, TC: AUTHOR [+3]

## Abstract

A residue threshold logic function is a universal logic function and is useful in logic design. Given a Boolean vector X of n elements, a residue threshold function is defined as (Image Omitted) where m is a positive integer and t is a nonnegative integer. See example, I.T. Ho and T.C. Chen, IEEE Transactions on Computers, Vol. C22, pp. 762-767, 1973.

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Bubble Domain Residue Threshold Logic Device

A residue threshold logic function is a universal logic function and is useful in logic design. Given a Boolean vector X of n elements, a residue threshold function is defined as

(Image Omitted)

where m is a positive integer and t is a nonnegative integer. See example, I.T. Ho and T.C. Chen, IEEE Transactions on Computers, Vol. C22, pp. 762-767, 1973.

The residue threshold logic function can be realized in magnetic bubble technology by using a combination of m idlers, an annihilation loop, and two magnetoresistive sensors. The vector X is represented by an incoming stream of bubbles (1's) and voids (0's) which is forced to go through the m idlers.

When exactly m bubbles are trapped in these idlers, the voltage induced in the sensor of the last idler activates the annihilation loop to clear all the bubbles in the idlers. This process is repeated to the end of the stream. Then the sensor of the t-th idler is used to determine whether the number of bubbles remaining in the idlers is greater than or equal to the threshold t.

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