Browse Prior Art Database

Push-Pull CLI Driver

IP.com Disclosure Number: IPCOM000047855D
Original Publication Date: 1983-Dec-01
Included in the Prior Art Database: 2005-Feb-08
Document File: 2 page(s) / 31K

Publishing Venue

IBM

Related People

Banker, DC: AUTHOR [+3]

Abstract

The push-pull current limited inverter (CLI) driver translates internal circuit levels into off chip driver levels and provides push-pull drive capability for the CLI circuit. The CLI internal circuit (not shown) operates from a power supply V1. However, in the push-pull driver configuration, only down-level clamp D1 and pinch resistor R1 are connected to the V1 supply. Load resistor R2 is connected to V2 to provide an up level sufficient to turn T3 and T4 on when T1 is off. With T1 on, current flows from R2 through inverter T1 and constant current source T2. The constant current source is driven by beta-tracking pinch resistor R1. Down-level clamp D1 prevents saturation of T1. Transistor T3 is a phase splitter which drives the Darlington pair T5, T6 and inverter T4 to provide push-pull output. Reference (*) D. C.

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Push-Pull CLI Driver

The push-pull current limited inverter (CLI) driver translates internal circuit levels into off chip driver levels and provides push-pull drive capability for the CLI circuit. The CLI internal circuit (not shown) operates from a power supply V1. However, in the push-pull driver configuration, only down-level clamp D1 and pinch resistor R1 are connected to the V1 supply. Load resistor R2 is connected to V2 to provide an up level sufficient to turn T3 and T4 on when T1 is off. With T1 on, current flows from R2 through inverter T1 and constant current source T2. The constant current source is driven by beta-tracking pinch resistor R1. Down- level clamp D1 prevents saturation of T1. Transistor T3 is a phase splitter which drives the Darlington pair T5, T6 and inverter T4 to provide push-pull output. Reference (*) D. C. Banker, F. A. Montegari and J. P. Norsworthy, "Current- Limited Inverter," IBM Technical Disclosure Bulletin 26, 7B, 3616-3617 (this issue, December 1983).

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