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Multiple Emitter Outputs to Perform Decode Functions

IP.com Disclosure Number: IPCOM000075940D
Original Publication Date: 1971-Dec-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 42K

Publishing Venue

IBM

Related People

Leininger, JC: AUTHOR

Abstract

Conventional current-switch circuits or blocks normally drive only a single emitter output. However, basic current-switch circuit blocks possess the capability of driving at least two emitter outputs with the attendant advantages of reducing the number of circuits required to provide a desired decode function, reducing module power and increasing performance, since only one level of delay is required to form logic functions previously requiring more than one stage of delay. The plurality,of blocks 10 represents basic current-switch circuits well-known in the art. The plurality of triangles 12 represents an inverse function with respect to a line, input or output, and the plurality of diamond shaped schematic elements 14 represents emitter-follower outputs.

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Multiple Emitter Outputs to Perform Decode Functions

Conventional current-switch circuits or blocks normally drive only a single emitter output. However, basic current-switch circuit blocks possess the capability of driving at least two emitter outputs with the attendant advantages of reducing the number of circuits required to provide a desired decode function, reducing module power and increasing performance, since only one level of delay is required to form logic functions previously requiring more than one stage of delay. The plurality,of blocks 10 represents basic current-switch circuits well- known in the art. The plurality of triangles 12 represents an inverse function with respect to a line, input or output, and the plurality of diamond shaped schematic elements 14 represents emitter-follower outputs. By allowing a pair of outputs, for example, 16 and 18 from a respective current-switch block 10, to each drive a pair of emitter-follower output circuits 14, the enumerated advantages are realized.

Implementation of this principle allows numerous combinations of current- switch emitter-follower blocks 10 to provide any desired logic function. For example, the blocks can be organized to provide either two or three-bit decode functions using the multiemitter principle. The illustrated circuit is arranged to provide a three-bit decode of input signals -A, -B and -C applied to their respective input terminals designated IN, in order to realize the decoded output...