Based on the research work theory for the UHF RFID reader, a new RF interface circuit of reader is introduced. The demodulation techique for reader is selected, and the research focuses mainly on zero-IF quadrature demodulator, gives its solution.%在对UHF RFID读写器工作原理进行分析的基础上,介绍一种工作在UHF频段下的读写器的射频接口电路,并确定读写器的解调方式,重点对正交零中频解调方式进行研究,并给出读写器的实现方案.
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