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drv2700做仿真时放大倍数和说明书不一致?

Other Parts Discussed in Thread: DRV2700

我准备做个压电电机驱动,按照drv2700说明书上连接电路选择参数后在Tina仿真的放大倍数结果与说明书都有区别。我不知是我的电路参数错误还是本来就会有这样的。如我设置11时是40.7db换算的倍数是108倍。但是我仿真的只有99.93。而且我设置成00、01、10时都与说明书不同程度的偏差。下面是我的电路图,和仿真测的放大倍数与实际倍数偏差。是我电路问题吗?望解答。