为PCB(印刷电路板)上的芯片提供电能不再是一种简单的工作。过去,通过细走线将IC连接到电源和地就行了,这些走线占不了多少空间。当芯片速度升高时,就要用低阻抗电源为它们供电,如用PCB上的一个电源层。有时候,只需要用四层电路板上的一个电源层和一个地层,就可以解决大多数电 Powering the chips on a PCB (printed circuit board) is no longer a simple task. In the past, the ICs were connected to the power and ground via thin traces that did not take up much space. When the chip speed increases, it is necessary to use low impedance power supply for them, such as using a power layer on the PCB. Sometimes, just one power plane and one formation on a four-layer board can solve most of the power