Browse Prior Art Database

Feedback Current Switch with Inhibit Input

IP.com Disclosure Number: IPCOM000085213D
Original Publication Date: 1976-Mar-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 2 page(s) / 28K

Publishing Venue

IBM

Related People

Henle, RA: AUTHOR

Abstract

This feedback current-switch circuit is capable of operating at small signal levels, for driving low-impedance transmission lines with matched impedances at low power. The low-output impedance of the circuit provides transmission line drive capability without the use of emitter-followers. The logic power loss due to the omitted emitter-followers is compensated by the addition of inhibit inputs to the feedback current switch.

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Feedback Current Switch with Inhibit Input

This feedback current-switch circuit is capable of operating at small signal levels, for driving low-impedance transmission lines with matched impedances at low power. The low-output impedance of the circuit provides transmission line drive capability without the use of emitter-followers. The logic power loss due to the omitted emitter-followers is compensated by the addition of inhibit inputs to the feedback current switch.

The feedback current switch comprises transistors 1 and 2 and feed-back transistor 3. Transistors 1 and 2 receive data signals C and D. The inhibit inputs A and B are applied to transistors 4 and 5 and provide an inhibit function (A.B) at each of the two current-switch outputs 6 and 7. The number of inputs may be expanded or reduced from those shown.

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