PERFORMANCE ANALYSIS OF SYMMETRICAL CMOS OTA WITH BULK DRIVEN CIRCUIT FOR ECG APPLICATIONS
PERFORMANCE ANALYSIS OF SYMMETRICAL CMOS OTA WITH BULK DRIVEN CIRCUIT FOR ECG APPLICATIONS
Authors:
V.V.K.D.V Prasad 1, Rohith Bala Jaswanth B 2, Aalla Uha Sri Priya3, Bandi Yaswanth Reddy4, Bhuvana Kruti Thota5, Chinnam Sneha6
1Professor, Department of Electronics and Communication Engineering, S. R. Gudlavalleru Engineering College, Gudlavalleru, India
2Associate Professor, Department of Internet of Things, S. R. Gudlavalleru Engineering College, Gudlavalleru, India
3, 4, 5, 6 Students, Department of Electronics and Communication Engineering, S. R. Gudlavalleru Engineering College, Gudlavalleru, India
Abstract - There's been a lot for biomedical circuits that don't use much power but still perform well, particularly in things like ECG monitoring. This project looks at designing and checking out a CMOS-based operational transconductance amplifier, or OTA, that is made to handle biomedical signals. ECG signals are weak signals and has low frequency, from about 0.05 Hz to 150 Hz, but the amplifier needs high gain, low power, and good common-mode rejection capacity [1]. After going through some study of this project, we picked a symmetrical OTA setup and built it with bulk-driven technology in CMOS. That bulk-driven helps with low-voltage and work better with input, which is suitable for portable ECG devices which run on batteries [2]. I implemented and simulated the whole in Cadence Virtuoso using a standard CMOS. It seems suitable for more generic CMOS process. After simulating, we checked parameters like differential gain, common-mode gain, frequency and phase responses, power, and stability with AC analysis. The differential gain came pretty high, and the common mode one was very low, so the CMRR improved a bit good. I tested it with different supply voltages and bias currents to see if we can use these for biomedical purposes. Power consumption is very low. Sometimes it's hard to get all these rights. The results show this OTA can amplify those ECG signals without issues, and it keeps power down. I think it's a great option and more suitable for integrating into small, low-power and wearable ECG monitoring systems.
Key Words: Operational Transconductance Amplifier (OTA), Bulk driven circuit.