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Ground Switching Load Modulation With Ground Isolation for Passive HF RFID Transponders

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3 Author(s)
Yunlei Li ; Dept. of Electr. Eng., Univ. of Texas at Dallas, Richardson, TX, USA ; Jin Liu ; Hoi Lee

This paper presents a ground switching load modulation scheme for passive HF RFID transponders. The proposed modulation scheme allows HF transponders to communicate with the reader in the strong field with a higher modulation index using simple RF clamps, compared with conventional resistive and capacitive load modulation schemes. Also presented is a ground-isolated voltage doubler rectifier to eliminate effects of parasitic diodes in CMOS processes, thereby increasing the communication distance. A 13.56-MHz transponder prototype was implemented in a standard CMOS 0.35-process. Measurement results show that the proposed transponder achieves over 35-mV modulation depth for the magnetic field strength from 0.15 to 7.5 A/m.

Published in:

Very Large Scale Integration (VLSI) Systems, IEEE Transactions on  (Volume:20 ,  Issue: 8 )