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OPA350使用问题

Other Parts Discussed in Thread: ADS1271, OPA350, REF3125

 

这是用ADS1271给的一个参考电压的电路图,中间opa350构成的电路,按理说这应该是一个低通的滤波器,但是我用TINA仿真分析,频率特性为什么会这样?