Reverse Engineering PCB for Mixed Signals in Separated Area

Reverse Engineering PCB for Mixed Signals in Separated Area, especially for the current electronic consuming products, most of them have the mixed signals on the separated area and PCB designer should be aware of this point.

As we all know, PCB with mixed signal circuit which include digital circuit and analog circuit could be extremely complicate compare with other PCB reverse engineering.

The electronic component arrangement, PCB layout as well as the power supply and grounding line treatment can directly affect the electrical performance and electro-magnetic performance after reverse engineering PCB. So the engineers will sufficient experience can optimize the mixed signal PCB reverse engineering and design features through the separation of ground and power supply circuit.

How to low down the cross interference among digital signal and analog signal? So designer need to understand the two basic principles of electro-magnetic compatibility before reverse engineering PCB: first principle is minimizing the current cycle area as much as you can; second principle is only one reference side should be taken into consideration in the system.

In the contrary, if system does have two reference sides exist, and a dipole antenna will probably emerge, however, miniature dipole antenna’s radiation range, circuit length, current go through and its frequency is in direct proportion. So if the signal fail to get cycle within as small loop as possible, it can probably form a larger cycle antenna. As we know, the amount of radiation in the small loop antenna will make direct proportion with loop area, current go through the loop and frequency. So in the process, engineer should avoid the above situations.

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