转载自:http://blog.eetop.cn/blog-1413227-6944466.html
这几个都是CMOS集成电路的相关的基本概念。转折区中点对应的输入电压通常会随着输入电压的变化而变化。。
HVT = High V threshold. Can be used in the path where timing is not critical. So by using HVT cells we can save power.
LVT - Low V threshold. One should use these cells in timing critical paths. These cells are fast but , comsumes more power due to its leakage. So it will consume more power. So use only when timing is critical.
SVT- Standard V threshold. Best of both world. Medium delay and medium power requirment. So if timing is not met by small magin with HVT, you should try with SVT. And at last LVT.
RVT-RegularV threshold. Another name for SVT.
阈值电压越低，饱和电流越小，速度性能越高；但由于漏电流越大，功耗越差。
速度按快到慢依次排列SLVT, LVT, RVT, HVT。 功耗正好相反。也就是说，HVT的cell阈值电压最大，掺杂浓度越高，泄漏功耗最小；