This paper is an investigation of off-chip solution of power converters for passive UHF RFID transponders. The power converter, consisting of a chain of schottky diodes and capacitors, is designed and then implemented on Rogers4350 PCB substrate. The ISM unlicensed frequency bands 915 MHz is used for RF signal. The de-embedded measurement results show that with minimum input power of -4.7dBm, the power converter achieves 1.8V/5uA output driving capability, which is sufficient for the transponder operation. It corresponds to a 3.6m operating distance when 4-W EIRP radiation is allowed.
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