在性能相当的条件下，一颗 PMOS 管的器件面积通常需要达到 NMOS 管的 2~3 倍。更大的面积不仅影响芯片的集成度，也会带来更高的导通电阻和输入输出电容，进而增加电路延迟。 与此同时，若尺寸相同，PMOS 的沟道导通电阻一般大于 NMOS，因此其开关过程中的导通 ...

不管是电源开关、电机驱动，还是各类转换器，NMOS总是首选。难道PMOS不好用吗？其实并不是，而是NMOS在性能上具有天然的优势。 要说清楚NMOS为什么更受欢迎，我们得先回到半导体物理的基础——载流子迁移率。简单来说，迁移率代表了载流子在电场作用下的 ...

For years—decades, in fact—the NMOS transistor world has been on cruise control. NMOS is naturally faster and its performance has scaled better than PMOS. PMOS has had a cost advantage. But lately, it ...

Even as industry moves into the era of the high k metal gate (HKMG) and FinFET transistor, chipmakers continue to seek ways to improve device performance. One of the latest advances and the subject of ...

PMOS transistors are less vulnerable to substrate noise since they’re placed in separate wells; designers implement guard rings to attenuate the substrate noise propagation. However, substrate noise ...

In our previous post Low Power LDO Design Techniques for Really Small Profile Applications, Part 1, we reviewed LDO design tradeoffs using an NMOS pass transistor. This design approach is proven good ...