The biggest problem in reverse engineering high-speed circuit board with operating frequencies exceeding 1 GHz is the loss of induced electricity. The general circuit only needs to consider the conductor loss, but the induced loss near 1 GHz is dominant.
Such a result is quite unexpected for beginners. The main reason is that the importance of the loss of induced electricity has been officially proposed in recent years. In view of this, the basic reverse engineering techniques of GHz high-speed circuit boards will be introduced. Quantitative analysis of frequency dependence of induced loss and conductor loss at high speeds.
The so-called induced loss refers to the loss caused by the leakage of the charge stored in the capacitor between the conductor (wire) and the ground line.
When the transmission speed of the board exceeds 2.5 Gbit/sec, the induced loss and the loss of the conductor are almost the same, so it is necessary to use the material of the substrate material for tandem (tan δ) or the size of the pattern and other Conditional change.
The effects of the induced loss and the conductor loss on the transmission waveform are investigated by means of analog analysis, and the above results are implemented to implement countermeasures so that signals exceeding GHz can be transmitted at high speed.
