Abstract: A radio frequency identification (RFID) tag and a method of monitoring Quality of Service (QoS) of a RFID tag The RFID tag (200) comprising: a first communication module (201) to receive signals from a RFID reader (100) and including means for extracting energy from the received signals providing a supply voltage Vdd to the RFID tag (200); an energy storage module (203) to store said extracted energy from the received signals of the RFID reader (100); a second communication module (202) to communicate with an external device (300); a power output (204) to provide a power-supply voltage to the external device (300) using said stored energy; a control module (205) to perform a tracking of said power-supply voltage provided by said power output (204), wherein the first communication module (201) also transmits to the RFID reader (100) a quality indicator of an energy status of the RFID tag (200) based on the result of said tracking.

Abstract: The RFID tag comprising: a first communication module (201) for extracting energy from received signals from a RFID reader providing a supply voltage VDD to the RFID tag (200); an energy storage module (203) to store said extracted energy from the received signals; a first voltage limiter (205) adapted and configured to limit, during a start-up state of the RFID tag (200), said supply voltage VDD; and a second voltage limiter (206), different to and synchronized with said first voltage limiter (205), said second voltage limiter (206) being adapted and configured to be enabled during a stationary state of the RFID tag (200) by switching from the first voltage limiter (205) to the second voltage limiter (206), the first voltage limiter (205) having a fast response time and the second voltage limiter (206) having high and accurate limitation voltage in powered operation.