A CMOS front-end for RFID transponders using multiple coil antennas

作者：Raben Hans^*; Borg Johan; Johansson Jonny

来源：Analog Integrated Circuits and Signal Processing, 2015, 83(2): 149-159.

DOI：10.1007/s10470-015-0518-y

• RFID
• Transponder
• CMOS
• Multiple antennas
• Orientation sensitivity
• Track and trace
• Inductive DC generation
• Energy harvesting
• Battery less
• Sequential system
• FSK modulation
• Load modulation

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 m 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.

• 出版日期2015-5