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如何减小放大滤波电路的噪声

Other Parts Discussed in Thread: INA128, INA828

本人用运算的放大器和仪表放大器设计了一款生物电信号电放大滤波电路,仿真结果时发现噪声在100Hz左右(大概这个范围)存在几微伏电噪声,想知道如何才能有效抑制电路噪声,有没有通用套路?谢谢!