Part Number: OPA189
Other Parts Discussed in Thread: OPA365
使用OPA189构成一个无源低通滤波(芯片采用0-5V供电),感觉没有效果,而且OPA189输出端噪声有点大.R=1K,C=1uF。滤波用在一个跨阻结构之后。如图直接在跨阻后面测VPP有40mV,
在经过无源滤波之后,VPP反而有70mV,这是为什么呢? 这个芯片自身为什么会带来这么大的噪声,看数据手册计算输出端噪声很小啊

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