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Which change would give the largest reduction in the average current of that design?

  • A.reducing the sleep current from 2 to 1 microampere
  • B.raising the clock frequency so the awake period is shorter
  • C.moving to a larger package with better thermal performance
  • D.reducing the awake fraction below one per cent

Answer: D

The running term is fifty of the fifty-two microamperes, so only attacking the duty cycle matters much. Raising the clock does shorten the awake period but usually raises the current in proportion, leaving the energy per task nearly unchanged.

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