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| How to resolve EMI/EMC issues in a product during design phase |
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| Sai teja:
Hello, Currently we are developing the product for an application. During the design phase, we are facing trouble in ensuring the product will comply EMI/EMC guidelines as per the market. Before going for Pre-Compliance Testing, are there any methods or techniques to resolve the EMI/EMC issues during the design phase? Please guide me in this regard. |
| David Hess:
I start by using circuits and layouts which minimize problems with EMI/EMC. This includes minimizing all loop areas, which usually means a ground plane these days, filtering and decoupling between assemblies, filtering at all chassis feed-through points, etc. |
| Siwastaja:
Component miniatyrization driven by the mobile tech really helps here. I tend to choose smallest components I can deal with in prototyping (so if I need to choose between a 0.3mm, 0.5mm, 0.8mm, 1.27mm or 2.54mm pitch part, the choice is usually 0.5mm, and the passive size is 0402), then design the functional sub-parts of the PCB as tightly as possible. This has two purposes, it enables me to easier squeeze the design in any form factor later (I may even have a lot of empty space on the prototype PCB due to this!), but it also makes the EMC better by * Minimizing loop areas, but also * Making shielding easier (a small thing is easy to surround with a small shield) * Making filtering easier (now we have saved space, and can afford the area of a filter!) |
| tggzzz:
You have to understand the basic physics. You have to think in terms of electromagnetic fields, not discrete circuit components. Then you design based on your understanding of the physics. You may be able to use some rules of thumb to guide you. You make design tradeoffs based on project cost/time/volume/timescales and the consequences of failures/respins. Then you test, and see what you missed. |
| Vovk_Z:
Look for "eevblog EMC" at youtube. There are some good books on noise and EMC, for example from Henry Ott (I can't find exact list). |
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