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放大器在无电源供电下,输入电压信号,竟然有输出。求教。。。

设计的放大器在无电源供电下,输入进电压信号,竟然有输出。电路设计的没错啊...求教。。。  

另外,在供电情况下,输入电压信号(没接光电二极管),得到的输出是输入的15倍左右,带宽是15MHz。仿真得到的图如下,红色线为交流输出:

电路如下图