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The dynamic power of a digital circuit is proportional to

  • A.\( CV^2f \)
  • B.\( CVf \)
  • C.\( C^2Vf \)
  • D.\( CV^2 \)

Answer: A

Each transition charges or discharges the node capacitance through the supply, so the energy per transition goes as the square of the voltage and the power as the rate of transitions. It is why lowering the supply is worth so much more than lowering the clock.

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