Architecture for RFID tag reader/writer
First Claim
1. A radio frequency identification (RFID) transceiver, comprising:
- a common frequency source configured to provide (i) a predefined intermediate frequency signal fIF, and (ii) a predefined carrier frequency signal fC;
an RFID receiving channel, comprising;
a single sideband upconverting mixer having a first input coupled to receive the predefined intermediate frequency signal fIF, a second input coupled to receive the predefined carrier frequency signal fC, and an output, the single sideband upconverting mixer operable to produce an upconverted signal at a frequency defined by fc±
fIF;
an image rejection downconverting mixer having a first input coupled to receive an RFID signal having a carrier frequency substantially at the predefined carrier frequency fC, a second input coupled to receive the upconverted signal, and an output, the image rejection mixer operable to produce a downconverted signal at substantially the predefined intermediate frequency fIF; and
an RFID transmitting channel comprising a modulator operable to modulate modulation data onto the predefined carrier frequency signal fC.
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Abstract
An RFID transceiver (200) includes a common frequency source (250), a receiving channel (230) and a transmitting channel (240). The common frequency source (250) is configured to provide a predefined intermediate frequency signal fIF, and a predefined carrier frequency signal fc. The RFID receiving channel (230) includes an upconverting mixer (232) having a first input coupled to receive the predefined intermediate frequency signal fIF, a second input coupled to receive the predefined carrier frequency signal fc, and an output, the upconverting mixer (232) operable to produce an upconverted signal at a frequency defined by fc±fIF. The RFID receiving channel (230) further includes an image rejection downconverting mixer (234) having a first input coupled to receive an RFID signal having a carrier frequency substantially at the predefined carrier frequency fc, a second input coupled to receive the upconverted signal, and an output, the image rejection downconverting mixer (234) operable to produce an output a downconverted signal at substantially the predefined intermediate frequency fIF. The RFID transmitting channel (240) includes a modulator (244) operable to modulate modulation data onto the predefined carrier frequency signal fc.
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Citations
21 Claims
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1. A radio frequency identification (RFID) transceiver, comprising:
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a common frequency source configured to provide (i) a predefined intermediate frequency signal fIF, and (ii) a predefined carrier frequency signal fC; an RFID receiving channel, comprising; a single sideband upconverting mixer having a first input coupled to receive the predefined intermediate frequency signal fIF, a second input coupled to receive the predefined carrier frequency signal fC, and an output, the single sideband upconverting mixer operable to produce an upconverted signal at a frequency defined by fc±
fIF;an image rejection downconverting mixer having a first input coupled to receive an RFID signal having a carrier frequency substantially at the predefined carrier frequency fC, a second input coupled to receive the upconverted signal, and an output, the image rejection mixer operable to produce a downconverted signal at substantially the predefined intermediate frequency fIF; and an RFID transmitting channel comprising a modulator operable to modulate modulation data onto the predefined carrier frequency signal fC. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 21)
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12. An radio frequency identification (RFID) transceiver, comprising:
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a single phase locked loop configured to provide (i) a predefined intermediate frequency signal fIF, and (ii) a predefined carrier frequency signal fC; an RFID receiving channel, comprising; a single sideband upconverting mixer having a first input coupled to receive the predefined intermediate frequency signal fIF, a second input coupled to receive the predefined carrier frequency signal fC, and an output, the single sideband upconverting mixer operable to produce an upconverted signal at a frequency defined by fC±
fIF.an image rejection downconverting mixer having a first input coupled to receive an RFID signal having a carrier frequency substantially at the predefined carrier frequency fC, a second input coupled to receive the upconverted signal, and an output, the second image rejection mixer operable to produce an output a downconverted signal at substantially the predefined intermediate frequency fIF; and an RFID transmitting channel comprising a modulator operable to modulate the modulation data onto the predefined carrier frequency signal fC. - View Dependent Claims (13, 14, 15, 16, 17, 19, 20)
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18. An radio frequency identification (RFID) transceiver, comprising:
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an antenna operable to receive an RFID signal; a circulator having a port 2 coupled to the antenna for transmitting/receiving the RFID signal, a port 3 for receiving a modulated RFID signal, and a port 1; a front-end amplifier having an input coupled to the circulator port 3 and an output; a single phase locked loop configured to provide (i) a predefined intermediate frequency signal fIF, and (ii) a predefined carrier frequency signal fC; an RFID receiving channel having an input coupled to the input of the front-end amplifier and an output, the RFID receiving channel comprising; a single sideband upconverting mixer having a first input coupled to receive the predefined intermediate frequency signal fIF, a second input coupled to receive the predefined carrier frequency signal fC, and an output, the single sideband upconverting mixer operable to produce an upconverted signal at a frequency defined by fC±
fIF;an image rejection downconverting mixer having a first input coupled to receive an RFID signal having a carrier frequency substantially at the predefined carrier frequency fC, a second input coupled to receive the upconverted signal, and an output, the image rejection mixer operable to produce an output a downconverted signal at substantially the predefined intermediate frequency fIF; and an RFID transmitting channel having an output coupled to port 1 of the circulator, the RFID transmitting channel comprising; a modulator operable to modulate the modulation data onto the predefined carrier frequency signal fC; and a power amplifier having an input coupled to the output of the modulator and an output coupled to the port 1 of the circulator.
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Specification