Abstract
A front-end architecture for inductive RFID transponders using multiple coil antennas for reduced orientation sensitivity is presented. The front-end uses multiple antennas for reception and one antenna for transmission. A select function identifies the antenna that is most favorably oriented toward the reader for transmission by comparing the DC charge-up phases of multiple DC generation blocks during power-up of the transponder. Design, simulations and measurement results of a front-end manufactured in 0.35 $$\upmu$$μm CMOS for 125 kHz FSK modulation are presented for a pulsed RFID system as well as an architecture for cascaded DC generation. This paper also includes a design example of a coil antenna for spherical transponders using three independent orthogonal windings.
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