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UCC27611驱动GaN FET时,OUT检测出干扰波

UCC27611搭建的驱动GaN FET电路,在FET的Drain极不加电源时,UCC27611输出波形正常,NGA的Drain极加电时,UCC27611输出端检测到干扰波,请帮忙看下是什么问题,谢谢

电路图如下:

不加80V偏置电压,测得EPC2016C的GS间的电压波形:

加了高压偏置电压,测得GS间的波形: