3 research outputs found
Voltage overâscaling CNTâbased 8âbit multiplier by highâefficient GDIâbased counters
Abstract A new lowâpower and highâspeed multiplier is presented based on the voltage over scaling (VOS) technique and new 5:3 and 7:3 counter cells. The VOS reduces power consumption in digital circuits, but different voltage levels of the VOS increase the delay in different stages of a multiplier. Hence, the proposed counters are implemented by the gateâdiffusion input technique to solve the speed limitation of the VOSâbased circuits. The proposed GDIâbased 5:3 and 7:3 counters save power and reduce the area by 2x and 2.5x, respectively. To prevent the threshold voltage (Vth) drop in the suggested GDIâbased circuits, carbon nanotube fieldâeffect transistor (CNTFET) technology is used. In the counters, the chirality vector and tubes of the CNTFETs are properly adjusted to attain fullâswing outputs with high driving capability. Also, their validation against heat distribution under different time intervals, as a major issue in the CNTFET technology is investigated, and their very low sensitivity is confirmed. The low complexity, high stability and efficient performance of the presented counter cells introduce the proposed VOSâCNTFETâGDIâbased multiplier as an alternative to the previous designs