Reverse Engineering PCB Board to Divide Digital Ground and Analog Ground is a necessary job because although they are connected, but the distance (circuitry wire) is long, it will be different. through clone printed circuit board layout netlist and extract schematic we can redesign the PCB design drawing;
Reverse Engineering PCB Board to Divide Digital Ground and Analog Ground
The same copper wire, the voltage at different points may be different, especially when the current is large. Because there is resistance in the wire, a voltage drop occurs when current flows. In addition, the wire also has distributed inductance. Under the AC signal, the influence of distributed inductance will show up.
Therefore, we must divide it into digital ground and analog ground, because the high-frequency PCB board design’s noise of digital signals is very large. If the analog ground and digital ground are mixed, the noise will be transmitted to the analog part, causing interference. If grounded separately, high-frequency noise can be isolated by filtering at the power supply. But if the two grounds are mixed, it is not easy to filter.
