Design and Implementation of Ultra Low Power Operational Trans-conductance Amplifier (OTA) for Biomedical Applications

Abstract

This paper presents a design of an ultralow-poweroperational transconductance amplifier (OTA) intended for biomedical application and realized in a 0.18 µm CMOS technology. The proposed OTA take advantages of bulk-drive (OTA) scheme to reduce power consumption . The OTA uses a single 0.8 v supply and dissipates 5.5 pw of power and provides 70 db gain which makes its suitable for use as a main block of many biomedical applications including implantable and wearable sensors. The simulation results are compared with conventional OTA structures. Some recent works indicates significant increases in gain and reduction in power consumption. The current reused OTA with low-power and low-noise capacitor feedback amplifier used for ECG signal applications. To develop the noise-power efficiency, the proposed OTA consists a current reused architecture. This adapts an inverter-based differential input stage for low noise.