QMOS digital logic circuit design

Abstract

This paper presents results of work to explore the feasibility of using resonant tunnelling diodes (RTDs) and conventional MOSFETs for the development of digital logic circuits. Based on the use of RTDs and MOSFETs, two di erent logic design stylesÐ ® xed pull-down and ® xed pull-upÐ are proposed and evaluated. Fixed pull-up gates perform better than their CMOS counterparts with similar device sizes. Since the proposed ® xed pull-down style avoids the use of series MOSFETs, for large fan-in gates it yields signi® cantly better performance than the corresponding CMOS gates.