如何滤除噪声电源轨

去耦电容的放置，是 PCB 布局中那种“一个简单规则被反复传播，却早已超出其实际适用条件”的典型话题之一。大家都很熟悉那条标准建议：把电容尽可能靠近电源引脚。设计人员会在数据手册、应用笔记、布局检查清单，甚至 AI 生成的示意图中反复看到这句话——这些图里电容常常像装饰边框一样围着每个 IC 排一圈。问题在于，这条建议把几种不同的 PDN 结构压缩成了一条规则，而这些结构的行为其实并不相同。 一旦明确了电容与负载之间的感性路径，放置决策就会容易得多。在某些板子上，哪怕只是把电容稍微移远一点，路径电感也会增加到足以让这个器件的效果明显变差。而在另一些板子上，尤其是电源层与地层间距很小的多层设计中，电容的具体位置可能就没那么敏感，因为平面本身提供了低电感电流路径。 关于去耦电容放置的背景 围绕去耦电容放置的“破除迷思”讨论，部分可追溯到 Todd Hubing 博士的 IEEE 论文，该论文研究了带有内部电源层和地层的多层 PCB。论文考察了：在采用低电感平面对之后

电源完整性分为两类：AC 和 DC。不要被这 5 个关于 AC 电源完整性的误区所误导。

了解如何在复杂的多板系统中管理电源完整性和 EMI。降低 PDN 阻抗，防止电压下跌，并避免代价高昂的 EMC 失效。

Embedded systems design and development is a broad area of electronics, spanning from developing code for an Arduino to designing custom computing systems with huge I/O count. On the more advanced end, where we see complex embedded systems for imaging, radar, modular computing, and edge computing, power regulator module design is a major determinant of system performance as it must ensure power integrity and signal integrity. These systems are

When PCB designers hear the term “PDN”, or “Power Distribution Network”, it might conjure up notions of bode plots, black magic, and other mysterious, scary things. In reality, the goal of the PDN is as straightforward as are most of the PCB design aspects that affect PDN performance. In this paper we’ll explain the various aspects of most PDN designs and how the PCB design software can influence them. OVERALL GOAL: SUFFICIENT CURRENT AND VOLTAGE

Learn how to successfully engineer the Power Delivery System Design so it meets the needs of new technologies.

A power supply’s efficiency is simply the ratio between the energy it consumes and the energy it supplies. No device can be perfectly efficient; there will always be losses in heat or electromagnetic fields. The leading causes come from active component losses (MOSFET and diode switching losses) and, to a lesser extent, from passive component losses (resistors, capacitors, and inductor impedance losses). It moves towards utilizing higher

Mark Harris, an expert PCB designer gives us some pointers to keep in mind when designing your AC to DC power supply. Read it now.

Prevent potential problems from incorrect power supply design. This article talks about PCB power supply design guidelines and tips.

Everything you need to know when designing high-power electronic devices. From traces, components, and thermal management, expert Mark Harris got it covered. Read this article to learn more.