Power Supply Decoupling

• CMOS power-supply current is dynamic

  • current pulse every active clock edge

• Peak current can be 5x the average current

  • instantaneous current peaks can only besupplied by decoupling capacitors

• Use one 0.1 μF ceramic chip capacitor for each power-supply pin

  • low L and R are more important than high C
  • double up for lower L and R if necessary
  • use direct vias to the supply planes, close to the power-supply pins

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