A Novel Design of Penternary Inverter Gate Based on Carbon Nano Tube

This paper investigates a novel design of penternary logic gates using carbon nanotube field effect transistors (CNTFETs). CNTFET is a suitable candidate for replacing MOSFET with some useful properties, such as the capability of having the desired threshold voltage by regulating the diameter of the nanotubes. Multiple-valued logic (MVL) such as ternary, quaternary, and penternary is a promising alternative to the binary logic design, because of less complexity, less computational step and reduced chip area. We propose two penternary inverters which are designed in the multiplevalued voltage mode based on CNTFET. In the first proposed design, the resistors are used to implement penternary logic whereas, in the second proposed design, they are replaced with the transistors. Extensive simulation results using HSPICE represent that the two proposed designs reduce significantly the power consumption and delay and sensitivity to process variations as compared to the state-of-the-art penternary logic circuit in the literature.