Power Management Circuit for Semi-Passive UHF RFID Transponder

This work develops a power management system that switches between RF rectified power and internal battery to power RFID transponder operating at ultra-high frequency band (860–915 MHz), with operating voltage of 1.8V circuit. The proposed design employs a single stage full wave rectifier, 4-stage Dickson charge pump and a novel switching circuit. The power management unit is able to sustain the operation of 1.82V, 15uA at
$120\mathrm{K}\Omega$
load. This is comparable with the performances of previously published works, but with less transistor counts due to the efficient design.