Ultra-low power PSK backscatter modulator for UHF and microwave RFID transponders

摘要

An integrated circuit implementation of a PSK backscatter modulator for passive radio frequency identification (RFID) transponders is proposed. Such modulator offers a significant reduction of the power consumption with respect to other schemes already presented in the literature. Furthermore, the topology of the proposed modulator allows us to control its output resistance so that only a negligible fraction of the active power at the antenna goes to the modulator.