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Static power in a modern process is dominated by

  • A.the quiescent current of the on-chip regulator alone
  • B.leakage through devices that are nominally off
  • C.the charging of node capacitance at each transition
  • D.the current drawn by the clock distribution network

Answer: B

Sub-threshold and gate leakage flow whether or not anything is switching, and they rise steeply with temperature and with process shrinkage. That is why a deeply sleeping part draws far more at seventy degrees than at twenty.

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