The Power consumption in the most of the systems are important. Today most of the processors are working in GHz, so their Power consumption also goes on increasing. In this paper, we first review the basic mechanisms that underlie Power saving techniques. Then we survey two fundamental techniques for power saving. Based on these two techniques we can reduce power Consumption in significant level. This paper determines Minimum energy consumption in voltage and frequency Scaling systems for given time delay. Finally, we summaries and discuss future research directions.
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