A clock-free decoder and continuous BLF generator for EPCglobal Gen2 UHF RFID tags

摘要

In this paper, a clock-free decoder and a continuous backscatter link frequency (CBLF) generator for EPCglobal Gen2 UHF radio frequency identification (RFID) transponders are presented. In order to reduce power consumption, the high frequency clock used in the decoder circuit is replaced by two analog integrators and two comparators. In addition, a relaxation oscillator controlled by another integrator generates a CBLF. Measurement results show that the generated CBLF meets the Gen2 protocol at all possible conditions. The total power of the decoder and CBLF generator is 0.84 μW at 1 V operating voltage. As a result, the tag with the proposed circuit can acquire longer read range and higher read rates.