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A 1V unregulated DC voltage from the rectifier of an energy harvesting node is converted down to 650mV regulated DC voltage with 10mV ripple (maximum frequency is 100MHz) by the switched-capacitor converter (SCC) that can supply up to 2.5mA current. For more supply sensitive loads such as RF blocks, a low dropout (LDO) voltage regulator steps down the SCC's output to 500mV regulated DC voltage with...