Browse Prior Art Database

Cross Coupled Work Line Clamping Circuit

IP.com Disclosure Number: IPCOM000051225D
Original Publication Date: 1982-Aug-01
Included in the Prior Art Database: 2005-Feb-10
Document File: 2 page(s) / 30K

Publishing Venue

IBM

Related People

Terman, LM: AUTHOR

Abstract

This article relates to improvements in CMOS decoder circuits wherein the floating word line condition which can occur in the decoder system is avoided.

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Cross Coupled Work Line Clamping Circuit

This article relates to improvements in CMOS decoder circuits wherein the floating word line condition which can occur in the decoder system is avoided.

In certain types of CMOS decoder circuits, word lines are connected in pairs, such that if one word line in the pair is selected, the other word line is floating and may be susceptible to noise coupling.

A solution to this problem is described herein and is shown in the figure. A cross-coupled pair is added between the pair of word lines A and B (presumably at the end away from the decoder), connected as shown. The word line which goes high will turn on the clamp device associated with the alternate word line in the pair, holding to the ground. If neither word line is selected, the cross-coupled pair is inactive. This is somewhat similar to the "quiet word flip-flop" discussed by Hoffman and Kalter in IEEE J. of Solid-State Circuits SC-8, 298-305 (October 1973) and described on p. 301. That system used a flip-flop per word line, and the flip-flop was always on. The approach here shares the cross-coupled pair over two word lines, and the flip-flop is always off except for a selected line.

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