EMC (Electromagnetic Compatibility) and Printed Circuit Board (PCB) design theory and layout are very important areas in electronic engineering, and while they may seem complex, there are some simplified methods to help understand and deal with them.
First, it is important to understand the basic concepts of EMC. EMC mainly focuses on the electromagnetic radiation generated by the equipment or system in its working environment and its adaptability to the external electromagnetic environment. EMC issues mainly include electromagnetic interference (EMI) and electromagnetic susceptibility (EMS). Methods to solve EMC problems mainly include suppressing disturbance sources, improving the anti-interference of equipment, and optimizing the electromagnetic compatibility design of equipment.
When it comes to printed circuit board (PCB) design, there are several key theoretical and layout points to consider. First, the return flow area should be reduced as much as possible so that the return flow path flows in the designed direction. This can be achieved through good layering, such as minimizing bypassing and decoupling of the power bus, and shielding the electromagnetic fields of the signal and power supply.
Secondly, adopt the correct wiring strategy. For example, you can use equal traces to reduce wire inductance, but try to avoid long equal traces to suppress crosstalk. In addition, the configuration of decoupling capacitors is also important, as they can suppress noise caused by load changes.
In addition, in terms of layout, related devices should be placed as close as possible to obtain better anti-noise effect. At the same time, devices that are prone to noise, small current circuits, high current circuits, etc. should be kept as far away from logic circuits as possible.
Finally, thermal design is also an important consideration. From the perspective of conducive to heat dissipation, it is best to install the printed plate upright, and the distance between the boards should generally not be less than 2cm.
Overall, while EMC and PCB design theory and layout may seem complicated, by understanding the basic concepts and following some basic principles, it is possible to optimize the performance and improve the reliability of your equipment and systems.