RFID READER WITH RECEIVER CLOCK DERIVED FROM TRANSMITTER OUTPUT
First Claim
1. A radio frequency identification (RFID) reader comprises:
- a transmitter section that includes;
an oscillation module coupled to convert a reference oscillation into a radio frequency (RF) oscillation;
a power amplifier module coupled to amplify and to modulate the RF oscillation in accordance with outbound modulation information to produce an outbound RF signal;
a receiver section that includes;
a clock recovery circuit coupled to generate at least one local oscillation (LO) signal from the outbound RF signal;
a preprocessing module operable to process an inbound RF signal to produce a preprocessed inbound RF signal;
a mixing module coupled to mix the preprocessed inbound RF signal with the at least one LO signal to produce a down converted signal;
a post processing module operable to process the down converted signal to produce a baseband signal; and
an analog to digital conversion module coupled to convert the baseband signal into an encoded inbound signal.
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Accused Products
Abstract
An RFID reader is operable to receive an inbound RF signal during transmission of an outbound RF signal. The inbound RF signal may be a modulated, backscattered signal from a tag that has substantially the same frequency as the outbound RF signal or at a different frequency from the outbound RF signal. The receiver section of the RFID reader is operable to down convert the inbound RF signal by using a transmitter signal generated by the transmitter section to generate at least one local oscillation signal. The receiver section then processes and digitizes the down converted inbound RF signal to produce an encoded inbound signal.
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Citations
23 Claims
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1. A radio frequency identification (RFID) reader comprises:
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a transmitter section that includes; an oscillation module coupled to convert a reference oscillation into a radio frequency (RF) oscillation; a power amplifier module coupled to amplify and to modulate the RF oscillation in accordance with outbound modulation information to produce an outbound RF signal; a receiver section that includes; a clock recovery circuit coupled to generate at least one local oscillation (LO) signal from the outbound RF signal; a preprocessing module operable to process an inbound RF signal to produce a preprocessed inbound RF signal; a mixing module coupled to mix the preprocessed inbound RF signal with the at least one LO signal to produce a down converted signal; a post processing module operable to process the down converted signal to produce a baseband signal; and an analog to digital conversion module coupled to convert the baseband signal into an encoded inbound signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A transceiver, comprising:
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a transmitter section, including; an oscillation module operable to generate a radio frequency (RF) oscillation signal; and a power amplifier module coupled to amplify and to modulate the RF oscillation signal in accordance with outbound modulation information to generate an outbound RF signal; and a receiver section, including; a clock recovery circuit coupled to generate an in-phase local oscillation signal and a quadrature local oscillation signal from a signal generated by the transmitter section; a preprocessing module operable to process an inbound RF signal to produce a preprocessed inbound RF signal, wherein the preprocessed inbound RF signal includes a desired RF signal component and a blocking RF signal component and wherein the blocking RF signal component includes a component of the outbound RF signal; a mixing module operable to minimize the blocking RF signal component in the preprocessed inbound RF signal by mixing the preprocessed inbound RF signal with the in-phase local oscillation signal to produce an in-phase down converted signal and by mixing the preprocessed inbound RF signal with the quadrature local oscillation signal to produce a quadrature down converted signal; a post processing module operable to process the in-phase down converted signal and the quadrature down converted signal to substantially remove the blocking RF signal component and produce a desired near baseband signal; and an analog to digital conversion module coupled to convert the desired near baseband signal into an encoded inbound signal. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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18. A radio frequency identification (RFID) reader, comprising:
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a baseband processing module operable to generate outbound modulation information; a transmitter section operable to convert the outbound modulation information into an outbound RF signal; and a receiver section operable to; generate at least one local oscillation (LO) signal from the outbound RF signal; process an inbound RF signal to produce a preprocessed inbound RF signal; mix the preprocessed inbound RF signal with the at least one LO signal to produce a down converted signal; process the down converted signal to produce a baseband signal; and convert the baseband signal into an encoded inbound signal. - View Dependent Claims (19, 20, 21, 22, 23)
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Specification