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Application Notes
As modern battery-powered devices and integrated circuits become more green and energy efficient, there is a growing need to make high sensitivity, low level current measurements to ensure these devices’ current consumption is within acceptable limits. The key applications calling for accurate power consumption measurement are battery-powered applications such as wireless mobile devices and consumer electronics. To maximize the battery life, engineers need to minimize the power consumption over the life of the product. Power is defined as P = V x I. The key enabler of reducing the power consumption of a device is to lower the average current consumption for a fixed supply voltage level.
A primary challenge in measuring the current consumption of battery-powered mobile devices, such as a cell phone or a tablet computer, is that the dynamic range of the current signal is very wide. The mobile device typically switches back and forth between active states, where it draws very high and fast peak currents, and an idle or standby current mode, where it draws very small DC and AC currents.
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