Architecture for RFID tag reader/writer

Details Architecture for RFID tag reader/writer Architecture for RFID tag reader/writer

2011-07-12

2011-07-12

Lu, Zhiyu (Department: 2618)

Telecommunications

Transmitter and receiver at same station

C455S311000, C455S314000, C455S323000, C455S325000

Reexamination Certificate

active

07979034

ABSTRACT:
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.

REFERENCES:
patent: 0195243 (2001-12-01), None
patent: 03098821 (2003-11-01), None
patent: WO 03/098821 (2003-11-01), None
International Search Report; PCT/SG2005/000047; mailed Apr. 8, 2005.
International Search Report, PCT/SG2005/000047, dated Aug. 30, 2007.

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