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超声波接受电路增益计算

Other Parts Discussed in Thread: TINA-TI

一个关于超声波测距的接受电路,接受部分原理图如下 关于电路讲解部分有如下

我计算的结果发现与文档想去甚远,例如计算C10/R6低通,我的方法是用C10在40K的容抗除以该容抗与R6的和,U8A (C13/R4)低通是用C13和R4的并联值除以R5,请问有什么错误吗