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ths3091一上电供电电压就被拉低

Other Parts Discussed in Thread: OPA820, THS3091

做的09年电子设计大赛宽带放大电路的题目。用了三级运放,前两级都是opa820,第三极用的是ths3091,7805和7905稳压出来的+-5V给opa820供电没问题,波形也出来了。问题是7815和7915稳压出来的+-15V的电压给ths3091供电的时候,刚上电,连信号都没输入,+-15V的电压就给拉低到只有2点多V,搞不懂是什么问题