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Friday, 9 March 2012

Why do we have capacitors at IC supply pins - another perspective

Why de-coupling cap?





Before we even try, we need to redo the schematic into some sort of diagram as shown below:
From the diagram it is obvious that there is no way for the amp to force the desired voltage across the load, since the current will need to be from the battery and the connection has series trace inductance!



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