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- W2290818964 abstract "Minimizing the power consumption of battery-powered systems is a key focus in integrated circuit design. The increased importance of power is even more notable for a new class of energy-constrained systems. These systems must achieve long system lifetimes from a limited energy source, so the need to reduce energy consumption whenever possible is paramount. Dynamic voltage scaling (DVS) [1] is a popular method to achieve energy efficiency in systems that have widely variant performance demands. As VDD decreases, transistor drive currents decrease, bringing down the speed of operation of a circuit. A DVS system adjusts the supply voltage, operating the circuit at just enough voltage to meet performance, thereby achieving overall savings in total power consumed. Figure 5.1a plots the required rate of the system versus the normalized energy required to process one generic block of data. The most straightforward method for saving energy when the workload decreases is to operate at the maximum rate until all of the required processing is complete and then to shutdown. This approach only requires a single power supply voltage (corresponding to full rate operation), and it results in linear energy savings. A variable supply voltage with infinite allowable levels provides the optimum curve for reducing energy. The energy savings that can be obtained out of dithering the voltage supplies will be explained in Section 5.3.1. While DVS is a popular method to minimize power consumption in digital circuits given a performance constraint, certain emerging applications like wireless micro-sensor networks [2, 3] and implantable medical electronics [4] are severely energy-constrained. For applications like implantable medical devices that are battery-operated, though the required speed of operation is low, the battery is expected to last till the lifetime of for Ultra-dynamic Voltage Scaled Systems" @default.
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- W2290818964 date "2008-01-01" @default.
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- W2290818964 title "Chapter 5 Adaptive Supply Voltage Delivery" @default.
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