RFID TRANSPONDER AND METHOD FOR OPERATING THE SAME

摘要

An RFID transponder having an analog front end receiver having an attenuator coupled to receive an RF-signal from an antenna and to attenuate the RF-signal, an amplifier having a fixed amplifier gain and being coupled to receive and to amplify the attenuated RF-signal and a control unit coupled to control a gain of the attenuator, wherein the control unit is configured to control the attenuator gain in response to a level of the amplified RF-signal, the control unit is configured to have a plurality of predetermined states causing the attenuator to increase (step-up) or to decrease (step-down), its gain by a predefined step size, wherein the step size of a step-up is equal to or smaller than the step size of a step-down and wherein the control unit is further configured to switch, upon reaching or exceeding a predefined threshold value, from a first to a second state having a smaller step size and causing the attenuator to change the gain such that the slope of the RF signal inverts and to switch, upon reaching the predefined threshold again, to a third state causing the attenuator to change a prefix of the gain.

主权项

1. Method of operating an RFID transponder having a front end for receiving a wake up pattern having a first and a second part concatenated to each other and a wake up pattern detector comprising a first and a second stage, wherein the first stage has a lower power consumption compared to the second stage, the method comprising the steps of:
detecting the first part of the wake up pattern at the first stage; and upon detection activating the second stage of the wake up pattern detector.