A RFID tag for communicating with an external reader comprising: two antenna connections (L A, L B) for connecting the RFID tag to an antenna, a receiver switch circuit for receiving two input sinusoidal signals from the two antenna connections (L A, L B) and generating a rectified waveform signal, a modulation detection circuit for receiving two input sinusoidal signals from the two antenna connections (L A, L B) and generating a first demodulation signal related to a 10% amplitude modulation of a RF field for communication between the reader and the RFID tag and a second demodulation signal related to a 100% amplitude modulation of a RF field for communication between the reader and the RFID tag characterized in that the receiver switch circuit is an active receiver switch circuit, wherein the active receiver switch circuit further includes a high speed comparator having as input the two input sinusoidal signals from the two antenna connections (L A, L B), wherein the active receiver switch circuit further includes two switches (16, 17) for respectively connecting to a ground the two input sinusoidal signals from the two antenna connections (L A, L B), the switches being arranged in such a way that the one of the two input sinusoidal signals having the lower voltage is connected to the ground, wherein the active receiver switch circuit further includes a third switch, a fourth switch and a non-overlapping circuit, the non-overlapping circuit receiving the output of the high speed comparator and generating two recovered clock signals (21, 22), respectively connected to third switch and the fourth switch, wherein the active receiver switch circuit includes a voltage limiter circuit. two antenna connections (L A, L B) for connecting the RFID tag to an antenna, a receiver switch circuit for receiving two input sinusoidal signals from the two antenna connections (L A, L B) and generating a rectified waveform signal, a modulation detection circuit for receiving two input sinusoidal signals from the two antenna connections (L A, L B) and generating a first demodulation signal related to a 10% amplitude modulation of a RF field for communication between the reader and the RFID tag and a second demodulation signal related to a 100% amplitude modulation of a RF field for communication between the reader and the RFID tag characterized in that the receiver switch circuit is an active receiver switch circuit, wherein the active receiver switch circuit further includes a high speed comparator having as input the two input sinusoidal signals from the two antenna connections (L A, L B), wherein the active receiver switch circuit further includes two switches (16, 17) for respectively connecting to a ground the two input sinusoidal signals from the two antenna connections (L A, L B), the switches being arranged in such a way that the one of the two input sinusoidal signals having the lower voltage is connected to the ground, wherein the active receiver switch circuit further includes a third switch, a fourth switch and a non-overlapping circuit, the non-overlapping circuit receiving the output of the high speed comparator and generating two recovered clock signals (21, 22), respectively connected to third switch and the fourth switch, wherein the active receiver switch circuit includes a voltage limiter circuit.