高速高密度PCB设计中电容器的选择

电容器在电子电路中有重要而广泛的用途。与传统的PCB设计相比,高速高密度PCB设计面临很多新挑战,对所使用的电容器提出很多新要求。此外,电容器技术和高速高密度PCB设计技术又都在不断发展。因而在高速高密度PCB设计中,电容器的选择是一个值得研究的问题。结合高速高密度PCB的基本特点,分析了电容器在高频应用时主要寄生参数及其影响,指出了需要纠正或放弃的一些传统认识或做法,总结了适用于高速高密度PCB的电容器的基本特点,介绍了适用于高速高密度PCB的电容器的若干新进展。

How to Select Capacitor in High-speed and High- density PCB Design

Capacitors are common component of electronic cir-cuits. Compared with the ordinary PCB design, the high- speedand high- density PCB design is faced with new challenges andneeds better performance of capacitors used in it. In addition,both the techniques for capacitors and the techniques for high-speed and high- density PCB design are making advances con-tinually. So how to select capacitors for high- speed and high-density PCB is worth research. The main parasitic parametersand their ill consequences of capacitors at high frequency arediscussed, some important misunderstandings pointed out, thecommon features of capacitors used in high - speed and high -density PCB outlined, and some relevant new techniques for ca-pacitors introduced.