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想搭建一个salen-key二阶滤波器,有高通和低通滤波器,高通截至频率为2K左右,低通为30M左右,然后增益为单位增益,由于电路板尺寸的问题,想问下有没有那种集成有两个模块的芯片,类似LM358之类的可以使用的??还有就是如何根据我的截至频率推测出 salen-key电容电感的值,有哪些可以查阅的文献??