Why we are connecting capacitor in series in high speed designs like SGMII. If it is to remove DC voltages, why we are not using on other signals like I2C, SPI and so on. What is the major purpose. Can anyone explain in easy way??
Main differences between the mentioned interfaces that SGMII is a differential one and its data rate is significantly higher than SPI and I2C.
Useful articles:
https://www.programmersought.com/article/3018835593/
http://www.sigcon.com/Pubs/news/4_15.htm
