去耦电容在高速PCB中的应用

Application of Decoupling Capacitor in High-Speed PCB Design

高速PCB设计中,合理地使用去耦电容在消除芯片逻辑切换时产生的RF噪声、防止电磁干 扰中具有重要作用。本文就去耦电容的容量及其具体应用作了较为详细的叙述,重点介绍了一些在PCB 上合理放置去耦电容的实用方法。

High-speed switching environments generate RF noise on power fines (or planes). The instantaneous current generated with the rising and falling edges of the outputs causes the power fine (or plane) to ring. Decoupling capacitors play a major role in conducting the alternating current. This paper describes proper selection and use of decoupling capacitors, and gives some practical layout solutions to minimize development and propagation of RF energy.