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A 1-V-input 0.45-V-output switched-capacitor (SC) voltage converter with voltage-reference-free pulse-density modulation (VRF-PDM) is proposed. The all-digital VRF-PDM scheme improves the efficiency from 17% to 73% at 50- output current by reducing the pulse density and eliminating the voltage reference circuit. An output voltage trimming by the hot-carrier injection to a comparator and...
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