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请大神帮助看下什么导致THS3095D无法输出负轨

Other Parts Discussed in Thread: THS3095

请教:

按照TI推荐电路进行设计(THS3095D)

在进行测试时,双电源使用±10V,波形分半见附件,输入信号见附件,为何输出端只有正电压?

是我PCB布局的问题吗?  我用仿真显示是正常的,就是实际测试出来波形不一致,

PCB布局见附件

测试中发现,当增益调整时(变大时),可以输出负电压,但是波形完全失真(同时多出一个小台阶),

当增益较小(2)时,输出没有小台阶,但是只有正波形

急急急,谢谢大家