本文回顾了过去一年芯片厂商在提高电源工作效率方面的进一步努力，阐述一些功率转换中所用的功率因数校正 (PFC) 及其它控制芯片。

60年前，科学家们在贝尔实验室证明了20世纪最重要的发明：第一只真正的晶体管。

generally switching transistors cause glitch due to kickback noise and clock feedthrough and hence these are generally separated from the input and output using a transistor which is always on……

some study material for a beginner in sigma delta design

To design SDM:
1.understand the principle of SDM;
2.determine the architecture of SDM according to the spec;
3.behavior modeling scale factor refering to the stablity;
4.behavior modeling the nonideal factor ,such as the cap noise vs. SNR,slew rate and…