我想设计一个截止频率连续可调的低通滤波器,可以指导一下吗?
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推荐两种方案:
(1)上面说的开关电容滤波器,需要MCU输出一路PWM频率来控制截止频率,我当时就用的TLC04,很好用。
(2)用数字电位器来控制特定电阻的阻值,从而改变截止频率,需要SPI或者I2C接口。