Discussion
Consider the following statements about low power design.
1. Dynamic power goes as the square of the supply 2. Leakage rises with temperature 3. A deeper sleep mode is always the better choice
Answer: A
Correct answer: 1 and 2 only are correct
Statements 1 and 2 are correct: dynamic power goes as the square of the supply, and leakage rises steeply with temperature, roughly doubling every ten degrees or so. Statement 3 is wrong - a deeper mode saves more current but costs more energy and time to enter and leave, and loses more state, so below a break-even interval a shallower mode wins. The right depth follows from how long the device will stay there.
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