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# Binary Logic Device

IP.com Disclosure Number: IPCOM000096682D
Original Publication Date: 1963-Sep-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 61K

IBM

## Related People

Mitcheli, AE: AUTHOR

## Abstract

The arrangement is a binary logic device which operates with fluid media. The device has several basic elements. These, in addition to input flows, have auxiliary flows which provide some amplification and which, by being switched on and off, allow the logical operation performed to be varied.

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Binary Logic Device

The arrangement is a binary logic device which operates with fluid media. The device has several basic elements. These, in addition to input flows, have auxiliary flows which provide some amplification and which, by being switched on and off, allow the logical operation performed to be varied.

The logic device is composed of two 3 input elements I and II and a free jet amplifier 5. X, Y and Z are variable input flows, while U and V are constant auxiliary flows. The upper input of element II is connected to the center output of element I. The Boolean expression for the flow in free-jet amplifier 5 is as follows:
N = X*Y*Z + (X bar)*(Y bar) (Z*U + Z bar*U bar*V) + V.Z bar (X*Y bar + X bar*Y)

(Image Omitted)

By switching U and V on and off in various combinations, four different solutions to the expression are obtained. Each represents a special logical operation performed. 1) With U and V both off N=X*Y*Z

This represents an And with three inputs and is physically represented by two input elements which are coupled in series. A multiple And can be produced by multiple series connections of 2 input elements. 2) When U is off and V is on N=Z(X*Y)+Z bar((X*Y) bar) With Z = 1, this expression represents an And for X and Y. With Z = 0, this expression represents a not And for X and Y. 3) When U is on and V is off N=Z(X*Y+X bar*Y bar) Therefore, for this variation of U and V, if the Z input is present, an inverted exclusive Or function of the input sign...