用于UHF RFID的自动调节泄漏载波抵消电路

An Adaptive Carrier Leakage Canceler for UHF RFID

用于UHF RFID的自动调节泄漏载波抵消电路采用功率反射相消技术和近似最速下降法的自动调节算法,主要解决UHF RFID读写器收发机载波泄漏问题。调节过程由FPGA控制,采用近似最速下降法,能够在100ms左右完成调节过程。通过本电路的泄漏载波抵消,UHF RFID收发机的隔离度可以在较宽的频带内达到60dB以上,峰值可以达到70dB。

The adaptive carrier leakage canceler for UHF RFID reader adapts the cancellation of reflected power technology and an adaptive method similar to the steepest method,and is used to cancel the leakage from TX to RX.The process is controlled by FPGA with the similar steepest decent method,which is finished in 100 ms.The adaptive carrier leakage canceler exhibits more than 60dB of carrier leakage cancellation over wide operating frequency band and the peak can reach 70dB.