SELF-HEATING COMPENSATION IN TEMPERATURE SENSOR RFID TRANSPONDERS

In this article we present the analysis and compensation of self-heating in a passive temperature sensor RFID transponder. The problem of heating due to the operation of the integrated voltage limiter can be observed in most RFID transponders. In temperature sensor RFID transponders this causes errors in the measured temperature, as the integrated sensor measures the IC temperature which is higher due to the operation of the voltage limiter. We propose a new algorithm of self-heating compensation with the use of an analogue to digital converter in the RE analogue front-end that measures the current level in the voltage limiter. The interrogator uses this value in the compensation equation that is presented in this paper.