A CMOS 2.45-GHz Radio Frequency Identification Tag IC with Read/Write Memory

摘要

A 2.45-GHz RFID tag chip was designed on standard 0.25-μm CMOS process. Using only MOS devices, the low-Vt rectifier circuit produces 100μW of power with 2dBm input. The tag IC with bi-directional communication and anti-collision features can be read from a distance of up to 15cm under a reader power of 250mW. The die area of 0.79mm{sup}2 includes a 128-bit rewriteable non-volatile memory.