【经验】EPC eGaN FET在LiDAR应用PCB layout技巧

时间： 2019-06-01 来源：世强

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激光雷达（LiDAR），是以发射激光束探测目标的位置、速度等特征量的雷达系统。其工作原理是向目标发射探测信号(激光束),然后将接收到的从目标反射回来的信号(目标回波)与发射信号进行比较,作适当处理后,就可获得目标的有关信息。

从上图可以看出，LD发送的脉冲宽度尽可能窄，这样才能很清晰区别距离相近实物之间的距离。这样就需要EPC GaN 器件实现高频开关。

PCB设计中的线路寄生电感会影响LD发送脉冲宽度以及能量，这就需要PCB设计过程中尽量减小线路寄生电感，合理布局，下面分享几点功率回路以及驱动回路PCB设计的几点小技巧：

1）功率回路layout建议遵循表层以及次外层电流异向原则以抵消电流磁场从而减小寄生电；

2）demo板中分流电阻是为了方便测试电流波形，后续可以考虑设计时去掉，可以最大程度缩短主功率回路寄生电感。目前采用0402封装贴片电阻，贴片加工是可以考虑反贴，这样表层电流路径能更靠近次外层，对减小寄生电感有帮助；

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