Abstract
This work presents an analog front-end (AFE) for the detection of multiple biopotential signals: Electroencephalogram (EEG), Electrocardiogram (ECG), and Electromyogram (EMG). The AFE is composed of three sections, the variable gain amplifier (VGA), the notch filter for eliminating the powerline interference signal, and the lowpass filter with variable bandwidth corresponding to detected signal. All sections are designed using nA/V operational transconductance amplifier (OTA) implemented in LTspice using 90 nm CMOS technology. Symmetric balanced OTA-C filter structure is used for both notch and lowpass filter of fourth-order. The notch filter is based on cascading of elliptic second-order filter, while the lowpass filter is based on direct implementation of modified fourth-order elliptic filter. The overall AFE composed of VGA, notch filter, and lowpass filter with DC gain of 30 dB and 50 Hz notch attenuation of 44 dB achieves an ultra-low power consumption of 14.5 nW.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.