采用这种技术时，电路板的元件侧专用于接地层，信号走线则布设在焊接侧。

In this technique, the component side of the board is dedicated to the ground plane, and signal traces are placed on the solder side.

youdao

电路板至少需要4层才能实现最佳布局和性能：一个接地层、一个电源层和两个信号层。

Best layout and performance are achieved with at least a 4-layer multilayer board, where there is a ground plane layer, a power supply layer, and two signal layers.

youdao

电路板至少需要4层才能实现最佳布局和性能：一个接地层、一个电源层和两个信号层。

Best layout and performance are achieved with at least a 4-layer multilayer board, where there is a ground plane layer, a power supply layer, and two signal layers.

youdao