A capacitive multi-threshold threshold gate design to reach a high-performance PVT-tolerant 4:2 compressor by carbon nanotube FETs.

This paper presents two new 4:2 compressors based on capacitive multi-threshold threshold logic (MTTG), and Carbon Nanotube Field Effect Transistors (CNFETs). The entire capacitor network is divided into two groups in one of the proposed designs. As a result, the number of voltage levels is reduced and the entire structure becomes less sensitive to Process, Voltage, and Temperature variations in comparison with other similar capacitive Threshold Logic (TL) circuits. All designs are simulated by Synopsys HSPICE and 32 nm CNFET technology in different situations and conditions. Simulation results demonstrate the superiority of the second proposed design. It operates 55.9% faster and consumes about 7.2% less power than the second best TL structure (CSTFA). It also operates 16.2% faster and consumes 13.6% less energy in comparison with a traditional design (BLG). Moreover, estimations show that the first proposed design occupies the least area among the capacitive TL circuits. [ABSTRACT FROM AUTHOR]