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Dynamic voltage and frequency scaling adjusts both because

  • A.a lower frequency permits a lower voltage, and the saving is then quadratic
  • B.the two quantities cannot be changed independently of one another in any device
  • C.raising the frequency requires the voltage to fall
  • D.the leakage current depends on the ratio of the two

Answer: A

Logic needs a minimum supply to meet its timing at a given frequency, so relaxing the frequency allows the voltage to come down and the square law then does the work. Scaling frequency alone saves power but very little energy per operation.

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