Automated switching mechanism for multi-standard RFID transponder

This paper presents an automated switching mechanism for a multi-standard modulator operating at high frequency (13.56 MHz) passive Radio Frequency Identification (RFID) transponder. The design adheres to the automatic switching of ISO 14443 (with a data rate of 106 kbps), and ISO 15693 Single Subcarrier (with data rate of 6.62 kbps and 26.48 kbps). The concept of the automated selection of the two different protocols is based on the incoming RF amplitudes; taking advantage of the different reading distances of the two protocols. The switch design is made up of envelope detector, CMOS operational amplifier, comparator with hysteresis, CMOS voltage reference and a 2-to-1 multiplexer. Simulation results verified that the proposed switch design is capable of switching to the desired ISO standard accordingly in a multi-standard transponder. This simulation work is designed and verified by using TSMC 0.18μm CMOS technology with an operating voltage of 1.8V.