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A view of energy conservation in mobile devices, Part 2

Posted: 16 Apr 2008     Print Version  Bookmark and Share

Keywords:energy reduction  power reduction  mobile device 

When talking about energy conservation, we need to distinguish between power reduction and energy reduction. There is a difference between energy and power. This article discusses power vs. energy types and how they affect mobile device platforms.

Energy is an integration function of power over time. Power can be broken into two types: static and active power. Static power comes from any DC current sources such as reference circuits, analogue designs, or even unwanted shorts in a product. Active power is from the switching activity of the circuitry where alpha is the switching activity. Just because we reduce power does not mean energy is reduced.

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