用于生物信号采集的 40nm CMOS 低噪声、低功耗电容斩波器仪器放大器

2024 IEEE 4th International Conference on Power, Electronics and Computer Applications (ICPECA) Pub Date : 2024-01-26 DOI:10.1109/ICPECA60615.2024.10471145

Yinglong Ding, Lu Liu, Bin Wang, Xiaokun Lin, Shuoshuo Zhu, Peng Cheng

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引用次数: 0

摘要

本文介绍了一种用于生物信号采集的低噪声电容耦合斩波仪器放大器。采用斩波调制技术有效抑制了电路的 1/f 噪声，并增加了一个正反馈回路 (PFL)，显著改善了电路的交流等效输入阻抗。此外，还增加了一个可选择开关的直流伺服环路 (DSL)，以消除电极带来的高达 50mV 的直流偏差。该仪器放大器采用 40 纳米 CMOS 工艺制造。1.2V 电源下的总电流消耗为 4μA。仿真显示，电路的 CMRR 和 PSRR 分别为 87dB 和 73dB，0.5 至 1kHz 范围内的积分噪声为 0.8μVrms。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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A Low Noise, Low Power Capacitor Chopper Instrumentation Amplifier in 40nm CMOS for Biological Signal Acquisition

A low noise capacitance-coupled chopper instrument amplifier for biological signal acquisition is presented. The chopper modulation technique is used to effectively suppress the 1/f noise of the circuit, and a positive feedback loop (PFL) is added to significantly improve the AC equivalent input impedance of the circuit. In addition, a DC servo loop (DSL) with selectable switching is added to eliminate the DC misalignment introduced by the electrodes up to 50mV. The instrumentation amplifier is realized in a 40nm CMOS process. The total current consumed at a 1.2V supply is 4μA. Simulation show that the CMRR and PSRR of the circuit are 87dB and 73dB respectively, and integration noise is 0.8μVrms in the range of 0.5 to 1kHz.

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2024 IEEE 4th International Conference on Power, Electronics and Computer Applications (ICPECA)

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