Adaptive voltage scaling reduces power in SoC designs

Mortensen, Gordon
September 2004
Portable Design;Sep2004, Vol. 10 Issue 9, p16
The article highlights that a systems on a chip (SoC) can help to reduce power consumption. Consumers have an ever-increasing appetite for new features in portable devices and an apparently unchanging expectation for the operating time between battery recharges. The result is that system and SoC design teams face the challenge of adding functionality while maintaining long battery life. Applying new power-saving technologies like voltage scaling helps maintain battery life while adding system features. Power reduction in SoC designs can be achieved with frequency and voltage scaling using open loop and closed-loop voltage control strategies. Computing systems execute tasks within real time deadlines. Dynamic voltage scaling (DVS) is accomplished using frequency and voltage pairs in an open-loop voltage control system. Adaptive voltage scaling is done using a closed-loop voltage control system that eliminates the need for frequency and voltage pairs while offering additional power savings. With the DVS system, the supply voltage value used for each operating frequency is the worst-case value needed over all silicon process and temperature variations.


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