Design and development of Two Stage Operational Trans-conductance Amplifier with single ended output for EEG Application

Abstract

In this work, a two-stage operational transconductance amplifier (OTA) with a single-ended output for electroencephalogram (EEG) applications is designed and developed. Amplification of biomedical signals, such EEG, must have high gain, low noise, and efficient power usage in order to guarantee precise monitoring and diagnosis. A common-source amplifier is used in the second stage of the suggested OTA to increase gain and bandwidth, while a differential amplifier is used in the first stage for strong common-mode rejection. An integrated compensating circuit enhances stability, while a biasing circuit guarantees appropriate operating conditions.In order to achieve an optimal trade-off between power efficiency, gain bandwidth (GBW), common-mode rejection ratio (CMRR), and phase margin, the circuit is developed and simulated using the Cadence Virtuoso IC design environment with a 180 nm CMOS technology. The findings show that the suggested amplifier is appropriate for biomedical signal acquisition since it achieves a gain of 28 dB, and a phase margin of 60°.