RFID reader architecture
First Claim
1. A reader for a radio frequency identification system, comprising:
- a transmitter operable to generate an outbound radio frequency (RF) signal;
a receiver operable to receive an inbound RF signal having a frequency similar to a frequency of said outbound RF signal, said inbound RF signal including a blocking signal corresponding to said outbound RF signal and a modulated RF signal produced responsive to said outbound RF signal, said receiver comprising;
a low noise amplifier operably coupled to amplify said inbound RF signal to produce an amplified inbound RF signal,a block cancellation module operably coupled to receive said outbound RF signal from said transmitter and to substantially cancel said blocking signal from said amplified inbound RF signal using said outbound RF signal and substantially pass said modulated RF signal, wherein said block cancellation module comprises;
a controller operably coupled to receive said outbound RF signal and to produce a cancellation signal from said outbound RF signal;
a carrier injection module operably coupled to receive said inbound RF signal and said cancellation signal and to substantially cancel said blocking signal and substantially pass said modulated RF signal using said cancellation signal; and
a feedback loop operably coupled to control said cancellation signal based on said modulated RF signal;
a down-conversion module operably coupled to convert said modulated RF signal to a near baseband signal, anda digitizing module operably coupled to convert said near baseband signal into a digital baseband signal; and
a processing module operably coupled to convert said digital baseband signal into inbound digital symbols.
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Accused Products
Abstract
A highly integrated and low-cost reader for a radio frequency identification (RFID) system is realized by providing a transmitter operable to generate an outbound radio frequency (RF) signal and a receiver operable to receive an inbound RF signal having a frequency similar to a frequency of the outbound RF signal on a single integrated circuit. Since the inbound RF signal may include not only a modulated RF signal produced by an RFID tag responsive to the outbound RF signal, but also a blocking signal corresponding to the outbound RF signal, the receiver additionally includes a block cancellation module operable to substantially cancel the blocking signal from the inbound RF signal using the outbound RF signal and to substantially pass the modulated RF signal before down-conversion of the modulated RF signal.
83 Citations
20 Claims
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1. A reader for a radio frequency identification system, comprising:
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a transmitter operable to generate an outbound radio frequency (RF) signal; a receiver operable to receive an inbound RF signal having a frequency similar to a frequency of said outbound RF signal, said inbound RF signal including a blocking signal corresponding to said outbound RF signal and a modulated RF signal produced responsive to said outbound RF signal, said receiver comprising; a low noise amplifier operably coupled to amplify said inbound RF signal to produce an amplified inbound RF signal, a block cancellation module operably coupled to receive said outbound RF signal from said transmitter and to substantially cancel said blocking signal from said amplified inbound RF signal using said outbound RF signal and substantially pass said modulated RF signal, wherein said block cancellation module comprises; a controller operably coupled to receive said outbound RF signal and to produce a cancellation signal from said outbound RF signal; a carrier injection module operably coupled to receive said inbound RF signal and said cancellation signal and to substantially cancel said blocking signal and substantially pass said modulated RF signal using said cancellation signal; and a feedback loop operably coupled to control said cancellation signal based on said modulated RF signal; a down-conversion module operably coupled to convert said modulated RF signal to a near baseband signal, and a digitizing module operably coupled to convert said near baseband signal into a digital baseband signal; and a processing module operably coupled to convert said digital baseband signal into inbound digital symbols. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method for operating an integrated reader for a radio frequency identification system, comprising:
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generating an outbound radio frequency (RF) signal; receiving an inbound RF signal having a frequency similar to a frequency of said outbound RF signal, said inbound RF signal including a blocking signal corresponding to said outbound RF signal and a modulated RF signal produced responsive to said outbound RF signal; amplifying said inbound RF signal to produce an amplified inbound RF signal; substantially cancelling said blocking signal from said amplified inbound RF signal by producing a cancellation signal from said outbound RF signal, substantially canceling said blocking signal and substantially passing said modulated RF signal using said cancellation signal and using a feedback loop to control said cancellation signal based on said modulated RF signal; converting said modulated RF signal to a near baseband signal; converting said near baseband signal into a digital baseband signal; and converting said digital baseband signal into inbound digital symbols. - View Dependent Claims (17, 18, 19, 20)
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Specification