Design of ternary logic circuits using CNTFET

Abstract

The work in this paper presents the design of ternary logic circuits using MOSFET-like carbon nanotube field effect transistor (CNTFET). The ternary logic is one of multivalued logic circuits which is the best substitute for traditional binary logic because of its low power consumption and low power delay product (PDP) resulting from reduced complexity of interconnects and chip area. CNTFET is preferred over Si-MOSFET for logic design due to its excellent thermal, mechanical and electrical properties. In addition, CNTFETs have the capability of having the desired threshold voltage by changing the diameters of the nanotubes, which make them a very suitable device for voltage mode multiple threshold circuit design. In this paper, we have shown how the ternary logic circuits can be efficiently designed using CNTFETs. The chirality of the carbon nanotube (CNT) is varied to vary the diameter of the CNT and hence the threshold voltage of the CNTFET. We have designed a ternary multiplier using CNTFETs at 32nm technology node. Our design shows ~ 2000 × less delay and 10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">4</sup> × less power as compared to that of existing designs.