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opa690前级放大,为什么噪声达到了100mv

Other Parts Discussed in Thread: OPA690

我用opa690作为前级放大,为什么噪声达到了。100mv,以下是我画的板,,各位大神给一下意见,看看我的板存在什么问题,为什么会有那么大的噪声