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Low-power methods of power sensing and frequency detection for wideband vibration energy harvesting

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Figure

Figure 1. Low-power frequency detection and power sensing system.
Figure 3. Low-power implementation of
Figure 5. Theoretical measurement voltage ΔVCm as a function of the output power. If one of the threshold is reached, the duration of the measurement period
Figure 5 demonstrates how the measurement period is changes with output power. The excitation frequency and amplitude are held constant and the power is changed by sweeping the duty ratio of the switching converter

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