When we Reverse Engineering Power Supply PCB Board, the Digital circuits often require discontinuous currents, so inrush currents are generated especially for some high-speed circuit board reverse engineering.
Reverse Engineering Power Supply PCB Board for its layout drawing, gerber file, BOM List and schematic diagram
If the power trace is very long, the presence of inrush current will cause high-frequency noise, and this high-frequency noise from Power supply PCB Board will be introduced into other signals. In high-speed circuits, there will inevitably be parasitic inductance, parasitic resistance, and parasitic capacitance.
Therefore, the high-frequency noise will eventually be coupled to other circuits, and the presence of parasitic inductance will also lead to the ability of the trace to withstand the maximum surge current decrease, which in turn leads to a partial voltage drop, which may disable the circuit.
add a bypass capacitor in front of the digital device
Therefore, it is particularly important to add a bypass capacitor in front of the digital device. The larger the capacitance, the transmission energy is limited by the transmission rate, so a large capacitor and a small capacitor are generally combined to meet the requirements of the full frequency range.
