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Power gating differs from clock gating in that it also removes

  • A.the leakage current of the gated block
  • B.the need for the block to be reinitialised on return
  • C.the clock to the rest of the device
  • D.the requirement for a low dropout regulator

Answer: A

Cutting the supply eliminates leakage as well as switching, which matters most in a deeply sleeping design. The price is that the block loses its state and must be configured again when it returns, which costs both time and energy.

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