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OPA277: 关于运放的自激振荡问题,奇怪的现象!!!

Part Number: OPA277


    在观察运放自激振荡的时候,发现一个奇怪的现象,运放接成如图的单位增益负相输入的形式,CL电容首先选取一个106的陶瓷电容,在示波器观察点处有Vpp=200MV,F=10K的自激振荡波形;

    但当CL电容换为10UF(106)的电解电容后,自激振荡波形消失,运放正常工作没有自激振荡现象,这是什么原因?电解电容的ESR比较大,形成隔离电阻?