SCH图如上所示 APD互阻放大 偏置电压+5V 反馈电阻680K 反馈电容焊上去的是1pF的电容
PCB layyout参考了数据手册上的 下图是经电容CL后的输出波形 可以看到上升沿处有一个拐角
想知道是不是应该调反馈电容CF
谢谢 PS：图为手机抓拍
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