세미나
생체 신호 (ECG, EEG) 기록을 위한 저잡음 저전력 증폭기 설계 세미나 (A Biopotential Amplifier with Robust Shielding Against L
- 2025.02.17
- 724
- Healthcare device에서 ECG, EEG 등 생체 신호
기록의 필요성
- 2개의
전극만을 사용하는 생체 신호 증폭기 회로 구조 설명
- 증폭기
설계 시 고려해야 하는 사항
1. 전원
노이즈 저감 회로 (Common-mode interference
suppression) 2. 입력 임피던스 향상 회로
(Input impedance boosting scheme by dual positive feedback)
Abstract:
This seminar presents two-electrode biopotential
recording sensor, integrating two key components: a Common-Mode Interference
Follower (CMI-Follower) and a Common-Mode Adaptive Current-Reuse OTA
(CMA-CR-OTA). The proposed CMI-Follower leverages the Miller effect through a
sensing capacitor to achieve high common-mode interference (CMI). This dynamic
suppression mechanism effectively mitigates CMI up to 133 Vpp while consuming
only 4.6 μW of power. Additionally, the noise-efficient CMA-CR-OTA enhances the
system’s resilience against residual CMI caused by dynamic user motion or
experience. The resulting design achieves a wide input common-mode range
exceeding 400 mVpp under a 1-V supply, ensuring robust operation in real-world
noisy environments.