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Tablet PCs or slates Mobile system power supplies 3 or 4 cell Li + battery-powered devices
Table 1. Average power and battery lifetime of the Itsy computer. The fourth column is the total power averaged over a complete battery discharge on three Itsy systems. The sixth column is the average battery lifetime for the same set of experiments. The eighth column is the effective battery capacity (power-lifetime product). Finally, The ninth column is total average power of one Itsy with the battery replaced by a 3.75 V power supply.
2001
"... In PAGE 10: ... 4. Results Table1 presents the average power and battery lifetime for the first-phase experiments.2 The benchmarks were run at a variety of frequencies and with the processor core at two different voltages.... In PAGE 10: ... Not surprisingly, the battery capacity drops slightly with the higher workloads. Table1 also shows the average power data taken for the corresponding experiments during the second phase. As ex- pected, this figure is always within the error on the average 2 When these results were first reported [19], the power presented did not include the power dissipated by the sense resistor (i.... In PAGE 10: ... Because the sense resistor used to measure the battery current is required by Itsy apos;s battery monitor, it should probably be con- sidered as part of the system. Therefore, the average power reported in Table1 is based on the same data, but has been re-calculated (as has its error) to account for the sense-resistor power. power during the battery-lifetime experiments, which con- firms that 3.... In PAGE 15: ...4 [19], the total power did not include the power dissipated by the sense resistor. As mentioned in Section 4, the average power P battavg reported in Table1 is based on the same data, but has been re-calculated to account for the sense-resistor power. This appendix presents the modifications made to the power calculation and to the error analysis, as well as the resulting values.... ..."
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Table 6: The power consumption, battery lifetime, and effective battery capacity of Itsy v2.
2000
"... In PAGE 17: ... The worst case calculated error introduced by this measurement procedure is less than 9% for all of the experiments, 5% if deep sleep is excluded [12]. The power and battery lifetime data are presented in Table6 . Data for the intermittent-use scenario is given in rows 1 to 9, and the continuous-use scenario in rows 10 to 16.... ..."
Cited by 3
Table 6: The power consumption, battery lifetime, and effective battery capacity of Itsy v2.
2000
"... In PAGE 17: ... The worst case calculated error introduced by this measurement procedure is less than 9% for all of the experiments, 5% if deep sleep is excluded [12]. The power and battery lifetime data are presented in Table6 . Data for the intermittent-use scenario is given in rows 1 to 9, and the continuous-use scenario in rows 10 to 16.... ..."
Cited by 3
Table 1 shows the approximate time it takes for the some of the major subsystems of a laptop to double in performance. In general, an unmanaged increase in performance also indicates some increase in power consumption. Based on current research, the growth rate of battery power output through the year 2000 is expected to be no more than 20% [15]. It is quite clear that unless there is a major advance in battery technology or power management, the mobility of mobile computers is going to be severely restricted by short battery life.
1995
"... In PAGE 2: ... Table1 : Time required to double performance. There is a tremendous amount of work being done in the eld of microprocessor design, and many power management techniques are being built-in in the hardware of the micro- processor itself.... ..."
Cited by 2
Table 4: Extending Battery Lifetime on an Alternative Platform: We assume a 2W CPU and MEMS disk, a base power of 0.02W, with a 3.7Ah battery and an operating voltage of 1.5v. The base power is 0.02W
2002
"... In PAGE 8: ...e.g., ad hoc routing or data fusion). Table4 shows the results of sharing the available currentcy be- tween the MP3 player (x11amp) and netscape for various amounts of available currentcy. X11amp requires 80mW to ensure contin- uous playback, the remaining capacity is available for netscape.... ..."
Cited by 93
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