Reverse Engineering Printed Wiring Board of Mixed Signal

Reverse engineering printed wiring board will refers to the mixed signals issue, especially for the current electronic consuming products, most of them have the mixed signals on the separated area after PRINTED WIRING BOARD reverse engineering and printed wiring board designer should be aware of this point. As we all know, PRINTED WIRING BOARD with mixed signal circuit which include digital circuit and analog circuit could be extremely complicate compare with other PRINTED WIRING BOARD reverse engineering. The electronic component arrangement, PRINTED WIRING BOARD layout as well as the power supply and grounding line treatment can directly affect the electrical performance and electro-magnetic performance after reverse engineering PRINTED WIRING BOARD. So the engineers will sufficient experience can optimize the mixed signal PRINTED WIRING BOARD reverse engineering and design features through the separation of ground and power supply circuit.

Use the light separation device or transformer can make the signal crossing separation space into practice. As for the previous one, the one which cross the separation space is light photon signals, in the application of transformer of reverse engineering printed wiring board, the one which cross the separation space is magnetic field. There is another feasible way for reverse engineering printed wiring board is using differential signals: signals flow into one line and revert from another one, in this situation, it is no need to use ground as revert route. In order to deeply understand the digital signals interference on analog signals in the process of printed wiring board reverse engineering. First thing need to do it get to know the features of high frequency current. High frequency current always choose the route with minimum resistance (low inductance), locate right beneath the signal line, and reverted current will consequently flow through the adjacent printed wiring board reverse engineering layer, regardless this adjacent layer is power supply layer or grounding layer.

 

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