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OPA656电压跟随器异常

Other Parts Discussed in Thread: OPA656

信号源通过BNC接口进入PCB,直接连接OPA656正输入端,无接地电阻,负输入端直接和输出相连

当正弦频率大于10M,Vpp=1V时,输入引脚上的信号会异常增大,即Vpp〉1V,并且随着频率增高而增大,按理说信号仅仅经过BNC头,高频应该变小才对

同时随着频率的增高,跟随器输出的增益也逐渐偏离1,越来越大

请问是因为运放自激吗?

运放输出端串接一个100欧电阻,然后进入无源滤波网络,没有直接接容性负载