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Dynamic Voltage Scaling

CMOS delay is inversely proportional to supply voltage.

Voltage to a region may be varied dynamically. A higher

Operating region of the frequency/voltage curve is roughly linear.


Let's only raise VCC when we ramp up f.


  2. then adjust VCC so logic just works.


Overall: power will then have cubic dependence on f. So we achieve peak performance under heavy loads and avoid cubic overhead when idle.


Power isolation is used on a longer and larger scale (complete continents).
