Evaluation of OTA Amplifier Using EEG Signals

Abstract

Abstract Over the last few years, there has been a tremendous exploration in VLSI industries in response to scaling trends towards deep submicron technology. Demand for low power and efficient amplification are rising in day-to-day life. In the process of scaling the CMOS nanometer demand low supply, which is helped to design digital circuit realization at very low power consumption. But it is not valid for analog circuit realization. The related drawback is short channel effect which results in low gain stages, decreased impedance etc. Different amplifiers are used to overcome these drawbacks but out of all those amplifiers, Operational Transconductance Amplifier (OTA) gives substantial results in the analysis of performance parameters. This project discusses about the performance analysis of amplifiers like Op-Amp, differential amplifier, instrumental amplifier, isolation amplifier, OTA for the amplification of EEG signals using CMOS technologies. The Operational Transconductance amplifier (OTA) plays an important role in Biological signal measuring electronic equipment like Electroencephalography (EEG) and Electrocardiography (ECG) systems which measure the health and activities of brain, heart, etc. The amplifiers are compared based on different performance parameters. The operational transconductance amplifier (OTA) is an amplifier whose differential input voltage produces an output current . Thus, it is a voltage controlled current source (VCCS). There is usually an additional input for a current to control the amplifier's transconductance . The OTA is similar to a standard operational amplifier in that it has a high impedance differential input stage and that it may be used with negative feedback . Various methods have been employed to increase the performance of the amplifiers for biomedical applications. Thus, further research would lead to a high performance Operational Transconductance Amplifier (OTA) implemented in CMOS technology with increased gain and CMRR along with low power consumption. Keywords: Voltage Controlled Current Source (VCCS), operational transconductance amplifier (OTA), Electroencephalography (EEG), Electrocardiography (EEG) Cite this Article B R B Jaswanth, P Manisha, D Prasanth Reddy, B K S S Phani Raj, B Naveen. Evaluation of OTA Amplifier Using EEG Signals. Trends in Opto-electro & Optical Communication . 2020; 10(2): 5–14p.