When we measure the signal on PCB with oscilloscope, we often find some strange phenomena in the waveform of the signal: for example, there will be a big peak and burr after the signal jumps, and there may be fluctuations behind the peak. Sometimes there is a platform on the edge of the signal, which is a bit like a person's shoulder. At other times, you may encounter that the edge of the signal rises unevenly, and there will be a groove, which rises to the middle, suddenly drops and then continues to rise. Looking back, have you ever encountered a similar situation? These phenomena are typical manifestations of signal integrity problems.

There is no unique standard definition of the word signal integrity, which usually refers to a phenomenon that the signal is distorted due to the interaction of signals, interconnection structures, power supply systems and other factors in high-speed PCB. At this point, it can be said that the signal was destroyed in the transmission process and became incomplete.

Regarding signal integrity, Dr. Yu is an expert in this field. You can check Dr. Yu's website online, which contains a lot of explanations and learning content. You can also pay attention to the official WeChat account (SIG007) focusing on the integrity of the doctoral signal. The video content is available, so you can learn it.