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OPA2695 不工作,发热。

Other Parts Discussed in Thread: OPA2695

我用opa2695 搭建一个约 200 MHz的70倍放大器。但线路不工作,片子烫手,烧毁。原理图如附件。

后我断开正增益放大器A,只保留负增益放大器B,工作电压降到+/-2.5V , 片子依然发烫,测量静态电压,
OutB输出0.322V,而 4脚的电压有-1.22V? 这是什么原因?制版、焊接都没问题。

请高手答疑解惑,不胜感激!

opa2695.doc