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Single I/O Balanced Driver

IP.com Disclosure Number: IPCOM000043678D
Original Publication Date: 1984-Sep-01
Included in the Prior Art Database: 2005-Feb-05

Publishing Venue

IBM

Related People

Authors:
Chang, AY Feinberg, I Walsh, JL Wu, LL [+details]

Abstract

A balanced input-output (I/O) driver is disclosed wherein current flow through pin inductances remains unchanged despite signal level transients. One of the problems of high speed communication between chips in a multiple-chip module environment or module-to-module communication environment is the so-called WI noise. The WI noise arises from the inductive voltage drop on the module power pin due to the surging current of the driver. Such noise will not only disturb non-switching circuits but will also slow down the rise time of the switching driver. These problems are addressed by the single I/O balanced driver. As shown in the figures, the driver consists of three transistors. The three transistors form a current switch configuration. Transistor 3 is the current source.