Design, Simulation and Comparative Evaluation of Active Filters Using 32-nm CNTFET-OTA

Abstract

In this paper an efficient simulation of low voltage and low power operational transconductance amplifiers (OTA) using carbon nanotube based field effect transistor (CNTFET at 32-nm technology node has done. The performance of the CNTFET-OTA is estimated by altering number of carbon nano tubes (CNTs) N, inter CNTs pitch (S) and CNT diameter (DCNT). The performance of CNTFET-OTA module has been thoroughly investigated it has been found that DC gain has hiked by 280%, transconductance and output resistance have increased by 256% and 262% respectively than bulk driven complementary metal oxide semiconductor OTA (CMOSOTA). A 136 times lesser power consumption and a total harmonic distortion (THD) of CNTFET-OTA which is 0.37 lesser than the conventional CMOS-OTA has been achieved. Further, Two voltage mode Active filters using bulk driven CMOS-OTA and proposed CNTFET-OTA topology are simulated. A significant increase in cut-off frequency is achieved using CNTFET-OTA second order filter structures.