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OPA593: 由运算放大器组成的有源低通滤波器将方波转换成正弦波,进而驱动压电换能器

Part Number: OPA593
Other Parts Discussed in Thread: DRV2700

我们通过全桥逆变得到频率为40k的方波,然后通过由OPA593组成的五阶巴特沃斯低通滤波器(由TI官网的Filter Design Tool自动生成)将该方波转变为频率为40k的正弦波,然后用该正弦波直接驱动频率为40k的压电换能器,发现正弦波波形失真,请问有什么办法可以避免失真。之前方波变正弦波,我们打算采用的是LC无源滤波,但是不清楚理论计算。压电换能器在40k附近的等效电路如下图所示,