Circuit for a passive RFID tag operating in a UHF band and method for operating a circuit

摘要

Passive RFID tag circuit operating in a UHF band and method for operating a circuit Abstract contents. A passive RFID tag circuit operating in a UHF band, configured for radio communication with a reader that outputs a periodic read signal, wherein a period of the read signal includes a phase of recovery of the read signal. energy and a communication phase. The circuit comprises: a control device configured to accumulate an energy reserve from the radio wave during the energy recovery phase and to communicate with the reader during the communication phase, an interface for connecting a sensor external analog. The interface includes: an electrical connection configured to connect and supply power to the external analog sensor l and to acquire the analog measurement from the sensor, an amplifier configured to amplify the analog measurement signal from the sensor, and an analog-to-digital converter ( ADC) configured to digitize the amplified analog sensor measurement, wherein the energy recovery phase includes an acquisition period during which the interface powers the external analog sensor, acquires, amplifies, and digitizes the measurement from the sensor. The invention further relates to a system and a method. Figure for the abstract: Fig. 2.