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求助///用频谱仪分析放大器的噪声问题

Other Parts Discussed in Thread: LM7705, LMP7716

大家好,

用了lm7705的evm板,想测试一下lm的charge pump频率是否会造成多余的噪声,lm7705的噪声如下》》

然后测试了没有信号输入时,lm7705和OPA的噪声,如下图

请问是什么原因造成了这个opa能产生这样的噪声呢?型号是lmp7716