Single-Stage Operational Transconductance Amplifier Design in UTBSOI Technology Based on gm/Id Methodology

Abstract

The downscaling of complementary metal-oxidesemiconductor (CMOS) technology is approaching its limits imposed by short-channel effects (SCE), thereby multi-gate MOSFETs have been proposed to extend the scalability. Ultrathin-body silicon-on-insulator (UTBSOI) transistor is one of the dual-gated devices which offers better immunity towards SCEs. In this paper, two designs have been proposed for single-stage operational transconductance amplifiers (OTA) using the CMOS and UTBSOI. The CMOS based OTA (CMOS-OTA) has been designed where sizing (W/L) of the constituting MOSFETs have been evaluated through gm/Id methodology and the same OTA topology has been simulated using UTBSOI (UTBSOI-OTA) considering the same W/L. The DC simulation is carried out over the BSIM3v3 model to store the operating point parameters in the form of graphical models. The mathematical expressions for performance specifications have been applied over the graphical models to evaluate the required W/L. Individual comparisons between the two proposed designs have also been carried out for further applications. Based on simulation results at the schematic level, the UTBSOI-OTA has higher DC gain of 33.26% and lesser power consumption of 2.81% over the CMOS-OTA. Moreover, comparative analysis of performance parameters like DC gain and common-mode rejection ratio (CMRR), have been compared with the best-reported paper so far. In addition to this, the UTBSOI-OTA has been applied to practical integrator circuits for further verification.