How To Reduce The Impact of PCB Stray Capacitance?

When referring to electronic circuits on the PCBA, a term often used is stray capacitance. Stray capacitance can exist between conductors on PCBs, prefabricated circuit boards for passive components, PCBA, between boards with mounted components, and between SMD component kits in component packages (especially ICs). Stray capacitance is one of the physical properties inherent in electronic circuits and circuit boards. So how to reduce the impact of PCB stray capacitance?


Reducing Parasitic Capacitance in PCB Layout | Sierra Circuits


Reduce PCB Stray Capacitance By PCB Design

1. Remove the inner ground plane
Since ground planes can increase capacitance with adjacent conductors due to their proximity, it helps to remove inner ground planes to increase the distance, which will minimize capacitive effects. This must be weighed against the benefit of minimizing the EMI gained when the ground plane is adjacent to the signal plane.

2. Use the Faraday Shield
A Faraday shield is a ground trace or plane that is placed between two traces, the PCB is designed to minimize capacitive effects between them, and like other shielding structures, it effectively reduces stray capacitance.

3. Increase the space between adjacent traces
Another effective mitigation technique is to increase the spacing between adjacent traces. This is a quite good method to apply as capacitance decreases with distance.

4. Minimize the use of vias
Through holes are a key element in making compact, complex PCBs possible. However, overuse may increase parasitic capacitance problems. Such as stray capacitance. This PTH coupling can be reduced by PCB design eliminating annular rings around vias on unconnected layers and minimizing the number of vias from components. Such as BGA.



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