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噪音仿真运放供电疑问

Other Parts Discussed in Thread: OPA333

附件PDF仿真图第一页有下载链接,我下载了。其中ECG Front End Noise这个图的U2供电是负电源,这正确吗?OPA333是单电源运放

但是仿真出来的效果和PDF P21是一样的。

7762.zhcu075.pdf

ECG Front End Noise.TSC