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RE: Opamp decoupling scheme

Posted by madisonears (A) on July 27, 2018 at 19:06:44

In Reply to: Opamp decoupling scheme posted by KanedaK on July 27, 2018 at 01:25:15:

Good question, and I hope someone else responds. There doesn't seem to be a definitive answer or consensus about which method is better, or even which type of cap is better, but I believe that the shortest path is the best. The important thing is to decouple, especially with higher speed opamps. Mixing the two methods will probably not be detrimental. It is, after all, LOCAL decoupling.

I've tinkered with this myself in my active xovers. For OPA627, decoupling is critical. After trying both methods, I could not say which one is better with any certainty. I violated the first rule by making the decoupling path an inch or so longer to get to a ground point rather than the simpler, shorter +/- single cap between the opamp supply pins. It might have sounded better with the separate plus/minus instead of the single cap across, and that's how I left it. There is another, less critical opamp in the filter, and it has the single + to - cap.

Peace,
Tom E
berate is 8 and benign is 9

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