Design of CNTFET-based Current-mode Multi-input m:3 (4 ≤ m ≤ 7) Counters.

This paper presents current-mode multi-input m:3 (4 ≤ m ≤ 7) counters based on carbon nanotube FET (CNTFET). Two different approaches are considered for these designs. In the first approach, a current mode m:3 (4 ≤ m ≤ 7) counter is achieved by means of current-mirrors in the output paths. The second proposed current-mode m:3 (4 ≤ m ≤ 7) counter is designed without requiring current-mirrors. This leads to lower number of transistors and lower power dissipation in comparison with the first approach. All of the designs are simulated using the Stanford CNTFET HSPICE model at 32 nm feature size. The results indicate that the second proposed designs are consistently faster and consume lower power than the first designs. Therefore, our PDP figure is improved by 35%, 30%, 36% and 26% as compared to those of current-mode logic (CML) counter 4:3, CML counter 5:3, CML counter 6:3 and CML counter 7:3, respectively. [ABSTRACT FROM AUTHOR]