killingspring 发表于 2014-11-23 00:07
恕我愚昧,对模拟电路不算太熟,先发表下自己的看法,我看不出来这些器件是怎么组成带通滤波的。我感觉这就 ...
Vm的作用:单电源供电,为运放提供偏置。
还有前面两个运放的作用是根据datasheet上看到的,这是原话:R1, C1, R2, C2, R3, C3, R4, C4 setup bandpass filter characteristics. With components as shown above the passband gain is approximately 70 dB with the 3 dB cutoff frequency of the filter at approximately 700 mHz and 20 Hz. 但这部分怎么分析我还不太明白
后面的那两个运放就组成窗口比较器了。