Design of TFET based Op-Amp and CCII for low voltage and low power applications

Abstract

ABSTRACT This paper presents design of an ultra-low-power two-stage Op-Amp and Second-generation current conveyor (CCII) using gm/ technique for portable applications like biomedical instruments, wireless sensor networks (WSNs), etc. The designed circuits are based on 20 m Tunnel Field-Effect Transistor (TFET). The circuits use a single power supply of 0.9 V and provide improvements in many areas when compared with Carbon Nanotube FET (CNTFET) based circuits and existing TFET-based circuits. The simulation set up in HSPICE, provide very low-power consumption for the same performanceand provide much better performance for the same power consumption when compared with existing circuits. In the case of TFET-based Op-Amp, for the power consumption of 47.1 W, the GBW and open-loop DC gain are 5.12 MHz and 75.9 dB, respectively. While for the power consumption of 107.1 W, the GBW and open-loop DC gain are 9.01 MHz and 74.9 dB, respectively. In case of TFET-based CCII, for the power consumption of 82.3 W, the 3-dB BW for Voltage and Current transfer gains are 700 MHz and 135 MHz, respectively. While for the power consumption of 173 W, the 3-dB BW for Voltage and Current transfer gains are 1.12 GHz and 226 MHz respectively.