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RLC和缓冲电路

Other Parts Discussed in Thread: OPA2690

请问一下

我们用函数信号发生器扫频进入一个RLC振荡电路

然后单独测RLC的输出时候,可以观察到RLC的对扫频信号的频率选择特性

接近RLC中心频率的幅度高,反之则幅度底。

但是把RLC的输入接到一个OPA2690的缓冲电路后

再测RLC的输出(及OPA2690缓冲级的输出)发现此时信号变成直流。