A novel adaptive leakage suppression method for UHF RFID reader

In this paper, a novel adaptive leakage suppression method (LSM) for ultra-high frequency radio frequency identification reader is proposed. The leaking power is reflected instead of absorbed to avoid saturating baseband circuits. The principle and application of this LSM based on selected power reflection actively controlled by digital baseband are discussed. The RF front-end is fabricated in a 0.13um CMOS mix-signal process and verified in a RFID reader transceiver prototype, which is composed by an NI SDR platform. The on-chip module dissipates 31.5mW from a 3.3V supply. Experiment results show that more than 44% of leaking power is reflected and an 87dB leakage suppression is achieved at a maximum transmitting power of 32dBm.