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Display Your Know How: Decoupling Capacitor

The golden rule of decoupling capacitor placement is to minimize the distance between the IC’s voltage pin and the capacitor.

What about the routing of the capacitor to POWER and GROUND pins/planes!!

Which among the above decoupling capacitor routing configurations is better?

Any improvements that can be done?

Simply answer by letter or include any reason to support your answer. Alternatives and opinions are welcome!

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JCTEYSSIER0 5 months ago

None of these. Better may be like "C" but Power placed up to IX pin/right of capacitor pin.

And depend aslo where the Ground pin of IC is located.

This is for numeric IC. For analog one the answer differ. Problematic is not the same.
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JCTEYSSIER0 5 months ago

None of these. Better may be like "C" but Power placed up to IX pin/right of capacitor pin.

And depend aslo where the Ground pin of IC is located.

This is for numeric IC. For analog one the answer differ. Problematic is not the same.
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PCBTech 5 months ago in reply to JCTEYSSIER0

Thanks for your insights, JCTEYSSIER0! I'd like to follow up on the placement of the Ground pin. Does its location have a significant impact on the decoupling capacitor routing?

Additionally, how does the consideration change when designing an analog IC? Are there specific guidelines or best practices to keep in mind?

I'd appreciate any thoughts or opinions on this matter, as it will help clarify the design considerations for Ground pin placement in both digital and analog contexts.
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