Ultra Low Power CMOS Low Pass Filter for Biomedical ECG/EEG Application

Abstract

The demand for biomedical application equipment is growing around the world today. Low voltage and low power are the most critical biomedical gear for lengthy battery life. Low power is the demand of any circuit and the low pass filter is the most essential representative processing block in the biomedical signal processing system. Hence, in this work present the low voltage, low power CMOS LPF for the biomedical application such as the EEG and ECG. The frequencies of the biomedical signals are very low. The frequency of EEG and ECG biomedical signals are 200Hz and 250Hz respectively. In this work, proposed and simulate the lower power CMOS low pass filter for biomedical application such as ECG, EEG. The low power, low transconductance OTA (Operational Transductance Amplifier) is employed because the basic elements of the planned filter style. In this design second order low pass filter is designed which frequency is tunable using the control voltage VC. We obtained the 2nd order low pass filter cutoff frequency 200Hz (i.e. Control voltage is -0.25V) and 250Hz (i.e. Control voltage is -0.23V) for EEG and ECG biomedical application respectively. The power consumption of the proposed low pass filter is 13.43nW for ECG application and 9.4nW for EEG application.