A novel RFID tag chip with temperature sensor in standard CMOS process

Abstract

This paper presents a novel RFID tag chip with temperature sensor in 0.18μm standard CMOS process. It consists of four blocks: RF/analog front-end circuit, 192-bit non-volatile memory (NVM), temperature sensor and digital baseband circuit. A CMOS UHF rectifier with dynamic bias using switch capacitor is proposed to improve the efficiency of rectification, while avoiding using costly Schottky diodes. We design a 192-bit NVM in standard CMOS process based on FN tunneling phenomenon with extremely small current density. It dissipates only 1.8μW/3.6μW for reading/writing operation. A 0.8μW smart temperature sensor with ±1 o C resolution without power hungry ADCs is achieved. As a result, the power consumption is 5.8μW, 6.8μW, and 8.6μW for reading sensor, reading NVM and writing NVM respectively. The chip core area is 0.6mm 2 in 0.18μm CMOS process.

A Low-Power Digital Baseband Processor for Passive UHF RFID Tag with Sensor and Sensor Interface

“…Passive UHF RFID tags are widely applied in supply chain management, logistics, public transportation, and so on. If some sensors can be embedded or combined with the tag, the application area of the tag will be much extended [1,2]. It is powered by harvesting RF electromagnetic wave energy from the reader.…”