Patent ID: 8977224
Filing Date: 2015-03-10
Classification: H04B

Abstract:
1. A transceiver for radio-frequency identification (RFID), comprising: a transmitter, for transmitting a carrier signal to an antenna; a receiver, having an input terminal, for receiving a wireless signal from the antenna through the input terminal; and a noise canceller, for generating a feedback current according to a part of the carrier signal, feeding the feedback current to the input terminal of the receiver, and adjusting the feedback current according to a signal strength of a noise in the wireless signal to eliminate the noise in the wireless signal, wherein the noise canceller comprises: a multiphase generator, for generating a pair of basic signals having a predetermined phase relation according to the part of the carrier signal; wherein the predetermined phase relation is one of a plurality of phase relations; and a programmable current generator, for generating the feedback current according to the pair of basic signals, and feeding the feedback signal to the input terminal of the receiver.