RFID READER ARCHITECTURE
First Claim
1. A block cancellation module within a radio frequency identification system (RFID) reader, comprising:
- a controller coupled to receive an outbound RF signal generated by the RFID reader and operable to produce a cancellation signal from the outbound RF signal;
a carrier injection module coupled to receive the cancellation signal and an inbound RF signal received by the RFID reader, the inbound RF signal including a blocking signal corresponding to the outbound RF signal and a modulated RF signal produced by an RFID tag responsive to the outbound RF signal, the carrier injection module operable to substantially cancel the blocking signal and substantially pass the modulated RF signal using the cancellation signal; and
a feedback loop coupled to control the cancellation signal based on the modulated RF signal.
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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.
5 Citations
19 Claims
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1. A block cancellation module within a radio frequency identification system (RFID) reader, comprising:
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a controller coupled to receive an outbound RF signal generated by the RFID reader and operable to produce a cancellation signal from the outbound RF signal; a carrier injection module coupled to receive the cancellation signal and an inbound RF signal received by the RFID reader, the inbound RF signal including a blocking signal corresponding to the outbound RF signal and a modulated RF signal produced by an RFID tag responsive to the outbound RF signal, the carrier injection module operable to substantially cancel the blocking signal and substantially pass the modulated RF signal using the cancellation signal; and a feedback loop coupled to control the cancellation signal based on the modulated RF signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for canceling a blocking signal from an inbound RF signal within a radio frequency identification (RFID) reader, comprising:
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receiving an inbound RF signal including a blocking signal corresponding to an outbound RF signal generated by the RFID reader and a modulated RF signal produced responsive to said outbound RF signal by an RFID tag; producing a cancellation signal from the outbound RF signal; substantially canceling the blocking signal and substantially passing the modulated RF signal using the cancellation signal; and using a feedback loop to control the cancellation signal based on the modulated RF signal. - View Dependent Claims (12, 13, 14, 19)
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15. The method of claim 15, wherein the producing the cancellation signal further comprises:
generating the cancellation signal in response to the outbound RF signal and the feedback signal. - View Dependent Claims (16, 17, 18)
Specification