Issues Encountered in PCB Assys

Electromagnetic Compatibility (EMC) is a major concern in PCB design. This involves ensuring that a device operates as intended in its electromagnetic environment without introducing intolerable electromagnetic disturbances to other devices or systems. EMC management requires careful attention to circuit board layout, component selection and shielding. When left unchecked, EMI and EMC can cause interference that can result in poor performance or even system failure. The good news is that most EMI and EMC problems are avoidable with a few simple PCB design best practices.

Noise: Noise is caused by stray currents flowing in the wrong directions on the PCB. This can affect the signal quality and lead to overheating or damage. It can also be caused by the parasitic capacitance and inductance of PCB traces and components. To minimize noise, it’s a good idea to use short, wide traces and to carefully consider the layout of your PCB.

Radiation: EMI can also be caused by radiation that is produced by the PCB itself or its internal components. Luckily, this can be easily prevented by proper shielding and the use of appropriate filters. Additionally, it’s a good idea to keep high-speed signals and clocks as short and adjacent to the ground plane as possible. This will help to reduce EMI and radio frequency interference.

Common EMI and EMC Issues Encountered in PCB Assys

Conduction: The majority of EMI issues in a PCB stem from conductors that are connected to other circuits without adequate decoupling. This problem is most commonly caused by poorly shielded cables and the use of improper grounding. Using shielded cables, low-pass filters and avoiding multiple ground connections in a split-plane PCB can all help to minimize this issue.

Crosstalk: This is a common problem that results from the mismatch of impedance between circuits on a PCB. This can be caused by using inappropriate signal traces, power supply pins, ICs and other devices. The easiest way to resolve this issue is to carefully plan the stack-up of your PCB during the early stages of layout, and to ensure that all components are properly grounded.

Other common EMI and EMC issues encountered in pcb assy are related to the lack of careful consideration of the regulated voltages on a PCB. This can lead to grounding loops and other issues that can significantly increase EMI levels. Using multiple ground planes can also be problematic, and it’s best to use them only where necessary.

It is important to recognize and avoid these common EMI and EMC issues to ensure that your electronic products comply with industry standards and will function reliably in any electromagnetic environment. By following these basic best practices, you can greatly improve your chances of passing EMC testing on the first try. If you are having trouble identifying and correcting these issues on your own, Mitai Augmented AI can provide expert recommendations to solve your EMC problems quickly and efficiently. Simply upload your PCB design and our AI will analyze it for potential EMC problems.