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Powering Tree Checker

IP.com Disclosure Number: IPCOM000082876D
Original Publication Date: 1975-Feb-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 2 page(s) / 28K

Publishing Venue

IBM

Related People

Hackett, R: AUTHOR [+4]

Abstract

A "Powering Tree Checker" ensures that all of the outputs from a fan-out powering tree, consisting of NOR circuits 10 on the left of the figure, are of the same polarity as the input signal. When the input to the tree 10 is positive, all the outputs must be positive; and, when the input is negative, none of the outputs should be positive. This is accomplished by a five-way plus NAND 12, when the outputs are positive, and a five-way plus OR 14, when the outputs of the tree are negative.

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Powering Tree Checker

A "Powering Tree Checker" ensures that all of the outputs from a fan-out powering tree, consisting of NOR circuits 10 on the left of the figure, are of the same polarity as the input signal. When the input to the tree 10 is positive, all the outputs must be positive; and, when the input is negative, none of the outputs should be positive. This is accomplished by a five-way plus NAND 12, when the outputs are positive, and a five-way plus OR 14, when the outputs of the tree are negative.

The output of the plus NAND 12 is gated with the input signal being positive, such that unless all of the powering tree outputs are positive, an error will be indicated. Conversely, the output of the plus OR is gated with the input signal being negative; so that if any of the outputs from the powering tree is still positive, an error will be indicated.

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