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VCA810噪声问题

Other Parts Discussed in Thread: VCA810, THS3001, OPA847

你好!我在使用芯片VCA810作为中间级放大时,控制电压Vc大约在-1.58~-1.65V和-0.4V左右时芯片的输出噪声比较高(达到了10mVpp),其他控制电压的时候输出噪声比较小(仅有3mVpp左右)。请问这种现象正常吗?不正常的话,造成这种现象的原因可能是什么呢?