Programable Bandwidth Bio-medical Amplifier for Multiple Bio-potential Signals Detection Systems

2021 IEEE International Midwest Symposium on Circuits and Systems (MWSCAS) Pub Date : 2021-08-09 DOI:10.1109/MWSCAS47672.2021.9531898

Israa Y. AbuShawish, S. Mahmoud

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引用次数: 1

Abstract

This work presents a tunable bandwidth bio-medical amplifier controlled by controlling the gain bandwidth of highly linear rail-to-rail operational amplifier. The proposed bio-medical amplifier capable to accommodate frequencies starts from 50 Hz up to 10 kHz to detect multiple bio-potential signals: EEG, ECG, EMG, PCG and Aps, using fixed and small load capacitance. The proposed bio-medical amplifier simply consists of two stages bio-amplifier each designed with constant Tera ohm MOS pseudo-resistors used as feedback resistors which also provides controllability to the lower cutoff frequency of the overall two stages bio-medical amplifier thus allowing the detection of the small frequency range. Simulations in LT-spice using the 90 nm CMOS model, BSIM4 level = 54 version 4.3 under +1 V supply voltage are performed to validate the performance of the proposed amplifier. High stability is maintained (phase margin ≥ 60°) over the whole frequency ranges and the overall power consumption of the bio-medical amplifier is not exceeding the 3.28 μW. The used op-amp facilitates reaching both rails of the supply voltage.

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多生物电位信号检测系统的可编程带宽生物医学放大器

本文通过控制高线性轨对轨运算放大器的增益带宽，提出了一种可调带宽生物医学放大器。所提出的生物医学放大器能够适应从50 Hz到10 kHz的频率，以检测多种生物电位信号:EEG, ECG, EMG, PCG和Aps，使用固定和小负载电容。所提出的生物医学放大器仅由两级生物放大器组成，每级生物放大器都设计了恒定的Tera欧姆MOS伪电阻作为反馈电阻，同时还提供了对整个两级生物医学放大器的低截止频率的可控性，从而可以检测小频率范围。在LT-spice中使用90 nm CMOS模型，在+1 V电源电压下进行了BSIM4电平= 54版本4.3的仿真，以验证所提出放大器的性能。在整个频率范围内保持高稳定性(相位裕度≥60°)，生物医用放大器的总功耗不超过3.28 μW。所使用的运放便于达到电源电压的两个轨道。

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2021 IEEE International Midwest Symposium on Circuits and Systems (MWSCAS)

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