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.
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