Mahdieh Nayeri - Department of Computer Engineering, Kerman Branch, Islamic Azad University, Kerman, Iran.
peiman keshavarzian - Department of Computer Engineering, Kerman Branch, Islamic Azad University, Kerman, Iran.
Maryam Nayeri - Department of Electrical Engineering, Yazd Branch, Islamic Azad University, Yazd, Iran.

This paper investigates a novel design of penternary logic gates usingcarbon nanotube field effect transistors (CNTFETs). CNTFET is a suitable candidate forreplacing MOSFET with some useful properties, such as the capability of having thedesired threshold voltage by regulating the diameter of the nanotubes. Multiple-valuedlogic (MVL) such as ternary, quaternary, and penternary is a promising alternative tothe binary logic design, because of less complexity, less computational step and reducedchip area. We propose two penternary inverters which are designed in the multiplevaluedvoltage mode based on CNTFET. In the first proposed design, the resistors areused to implement penternary logic whereas, in the second proposed design, they arereplaced with the transistors. Extensive simulation results using HSPICE represent thatthe two proposed designs reduce significantly the power consumption and delay andsensitivity to process variations as compared to the state-of-the-art penternary logiccircuit in the literature.

CNTFET, Delay, Multiple-Valued Logic, Inverter, Penternary, Power Consumption