An RFID transceiver (200) includes a common frequency source (250), a receiving channel (230) and a transmitting channel (240). The common frequency source (250) is configured to provide a predefined intermediate frequency signal fIF, and a predefined carrier frequency signal fc. The RFID receiving channel (230) includes an upconverting mixer (232) having a first input coupled to receive the predefined intermediate frequency signal fIF, a second input coupled to receive the predefined carrier frequency signal fc, and an output, the upconverting mixer (232) operable to produce an upconverted signal at a frequency defined by fc±fIF. The RFID receiving channel (230) further includes an image rejection downconverting mixer (234) having a first input coupled to receive an RFID signal having a carrier frequency substantially at the predefined carrier frequency fc, a second input coupled to receive the upconverted signal, and an output, the image rejection downconverting mixer (234) operable to produce an output a downconverted signal at substantially the predefined intermediate frequency fIF. The RFID transmitting channel (240) includes a modulator (244) operable to modulate modulation data onto the predefined carrier frequency signal fc.
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机译：RFID收发器（ 200 ）包括公共频率源（ 250 ），接收通道（ 230 ）和发送通道（ 240 ）。公共频率源（ 250 ）配置为提供预定义的中频信号f IF 和预定义的载波频率信号f c 。 RFID接收通道（ 230 ）包括一个上变频混频器（ 232 ），该混频器的第一输入耦合为接收预定义的中频信号f IF ，第二输入耦合以接收预定的载波频率信号f c ，以及输出，上变频混频器（ 232 ）可操作以产生由f定义的频率的上变频信号 c ±f IF 。 RFID接收通道（ 230 ）进一步包括镜像抑制下变频混频器（ 234 ），该镜像抑制下变频混频器具有第一输入，耦合以接收具有基本上在预定载波处的载波频率的RFID信号频率f c ，耦合以接收上变频信号的第二输入和输出，镜像抑制下变频混频器（ 234 ）可用于产生基本上在下变频的下变频信号预定义的中间频率f IF 。 RFID发送通道（ 240 ）包括调制器（ 244 ），该调制器（ 244 ）可用于将调制数据调制到预定义的载波频率信号f c 上。
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