A 3.4Mb/s RFID Front-end for Proximity Applications Based on a Delta-modulator

Abstract

A 13.56MHz RFID front-end uses multi-level signaling to achieve 3.4Mb/s operation. The circuit is built around a delta-modulator loop which ensures demodulation and ADC functions as well as supply-voltage regulation. The circuits are fabricated in a 6M 0.18mum 1.8V digital CMOS process in an area of <0.5mm2