用于生物医学多通道集成系统的1.55 NEF, 2µA斩波放大器设计

2022 29th International Conference on Mixed Design of Integrated Circuits and System (MIXDES) Pub Date : 2022-06-23 DOI:10.23919/mixdes55591.2022.9837969

Pawel Wargacki, P. Kmon

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引用次数: 0

摘要

我们提出了一种基于低噪声斩波的生物医学记录放大器的设计。它是采用40nm CMOS技术制造的多通道集成系统的一部分。它具有直流稳定回路补偿电极偏移和正反馈输入阻抗提升。第一级采用双电流再利用。在1V供电电压下，每通道功耗为2µA，硅面积仅为0.044mm2。本研究提出了一种新颖的输入级，结合了堆叠输入对的低噪声性能和折叠级联放大器的高直流增益。模拟的输入参考噪声在0.5 ~ 100hz频段为0.96/µVrms，在100hz ~ 10khz频段为2.8µVrms，噪声效率系数分别为5.29 (0.5 ~ 100hz)和1.55 (0.1 ~ 10khz)。

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Design of 1.55 NEF, 2µA, Chopper Based Amplifier in 40nm CMOS for Biomedical Multichannel Integrated System

We present a design of a low-noise chopper based amplifier for biomedical recordings. It is a part of a multi-channel integrated system fabricated in 40nm CMOS technology. It features a DC stabilizing loop for compensating electrode offset and positive feedback for input impedance boosting. The first stage uses double current reuse. Design consumes 2µA per channel under 1V supply voltage and occupies only 0.044mm2 of silicon area. A novel input stage presented in this work combines a low noise performance of a stacked input pair with the high DC gain of the folded cascode amplifier. The simulated input-referred noise is 0.96/µVrms in the 0.5-100Hz frequency band and 2.8µVrms in the 100Hz-10kHz frequency band, respectively, leading to a noise-efficiency factor of 5.29 (0.5-100Hz) and 1.55 (0.1-10kHz).

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来源期刊

2022 29th International Conference on Mixed Design of Integrated Circuits and System (MIXDES)

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