The principle and simulation of the TDR test

摘要

As we all know, when the light passes from air to water, there will be part of the light reflected on the surface of the water. The transmission of electrical signals in the transmission line is similar to this situation, the transmission line can be seen as the electromagnetic signal transmission medium, and characteristic impedance is an important parameter describing the medium. In this article, first we start from the definition of the TDR, then introduce the principle of the TDR test, at the same time suggest two methods of the TDR test and analyze the advantages and disadvantages of the two methods, at last give the result of the TDR test of using software simulation and hardware testing.