Reverse Engineering Printed Circuit Board Featurized Impedance
Reverse Engineering Printed Circuit Board Featurized Impedance is a critical process mainly happens in the high speed multilayer ones, through the layout drawing, Controlled impedance is the characteristic impedance of a transmission line formed by PCB conductors. It is relevant when high-frequency signals propagate on the PCB transmission lines. Controlled impedance is important for signal integrity: it is the propagation of signals without distortion.
When replicate PCB plate, the variation of technology process can cause the practical impedance difference and there are some field solver tools with on-site preciseness to foretell this phenomenon. Even without the variation of technical process, the practical impedance will have great change caused by other factors. when reverse engineering high speed Printed Circuit Board, the automatic design tools won’t be able to spot these issues which are not so obvious but very important. As a result of that, these issues can avoid in the process of Printed Circuit Board cloning if there are several precautions measures have been taken in the early stage of PCB board copying which can be viewed as the defensive design.
Lay-up issue for Printed Circuit Board reverse engineering
An outstanding lay-up structure could be viewed as the best defensive measures in the course of most of the signal integrity and electro-magnetic control, at the same time, it is the easiest part to be misunderstood. And there are several factors are playing their effect, anyway, one solution which can be used to deal with an issue could deteriorate the situations of other issues.
Most of the system design vendors will suggest that PCBA replication process should have at least a substantial platform to control the quality of signals and featurized impedance as long as the cost is affordable. This is a good advice. EMC consultant even suggest to have ground fill on the ground layer of external environment or ground layer to control the electro-magnetic radiation and sensitivity of electro-magnetic interference.
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