Method and device for suppressing a transmitting signal in a...

Details Method and device for suppressing a transmitting signal in a... Method and device for suppressing a transmitting signal in a...

2007-04-05

2008-11-25

Nguyen, Tai T (Department: 2612)

Communications: electrical

Condition responsive indicating system

Specific condition

C340S572800, C340S010100, C340S010200, C340S010510, C455S078000, C455S079000, C455S136000, C455S278100, C455S296000

Reexamination Certificate

active

07456747

ABSTRACT:
A method and apparatus is disclosed for operating an RFID read/write unit with transmitting signal suppression. The RFID read/write unit comprises a radio frequency part including a transmitter and a receiver, and a baseband part based on digital signal processing. The method involves producing an amplitude and phase weighted copy of a transmitting signal, namely a compensation signal, with the baseband part. After linear modulation of the compensation signal, a resultant signal at an input of the receiver is subtracted in an addition stage from a spurious coupling signal. The transmitting signal has an auxiliary signal impressed upon a carrier signal from the RFID read/write unit with a frequency offset fd, for the purpose of processing without any DC voltage in the receiver downstream of an RX converter. The input of the receiver comprises a turn-on and turn-off attenuation element which protects the radio frequency part.

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