Homodyne RFID receiver and method
First Claim
1. An RFID circuit, comprising:
- an RF carrier signal source;
a hybrid coupled to the RF carrier signal source operable to generate first, second and third phase-shifted RF carrier signals;
first, second, and third mixers coupled to the hybrid each operable to multiply one of the first, second and third respective carrier signals and a backscattered modulated carrier signal and generate first, second and third baseband signals, respectively;
first, second, and third delay lines respectively coupled to the first, second, and third mixers and operable to generate first, second and third delayed baseband signals; and
logic coupled to the first, second, and third mixers and the first, second, and third delay lines and operable to detect substantially simultaneous data transitions in at least two of the first, second, and third baseband signals, and generating a reconstucted signal having a data transition in response thereto.
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Accused Products
Abstract
An RFID circuit comprises an RF carrier signal source, and a hybrid coupled thereto operable to generate first, second and third phase-shifted RF carrier signals. The circuit further comprises first, second, and third mixers coupled to the hybrid each operable to multiply one of the first, second and third respective carrier signals and a backscattered modulated carrier signal and generate first, second and third baseband signals, respectively. The circuit further comprises first, second, and third delay lines respectively coupled to the first, second, and third mixers and operable to generate first, second and third delayed baseband signals. The circuit further comprises logic coupled to the first, second, and third mixers and the first, second, and third delay lines and operable to detect substantially simultaneous data transitions in at least two of the first, second, and third baseband signals, and generating a reconstructed signal having a data transition in response thereto.
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Citations
28 Claims
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1. An RFID circuit, comprising:
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an RF carrier signal source; a hybrid coupled to the RF carrier signal source operable to generate first, second and third phase-shifted RF carrier signals; first, second, and third mixers coupled to the hybrid each operable to multiply one of the first, second and third respective carrier signals and a backscattered modulated carrier signal and generate first, second and third baseband signals, respectively; first, second, and third delay lines respectively coupled to the first, second, and third mixers and operable to generate first, second and third delayed baseband signals; and logic coupled to the first, second, and third mixers and the first, second, and third delay lines and operable to detect substantially simultaneous data transitions in at least two of the first, second, and third baseband signals, and generating a reconstucted signal having a data transition in response thereto. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method comprising:
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generating a carrier signal; receiving a modulated carrier signal; multiplying the received modulated carrier signal and first, second, and third phase-shifted carrier signals and generating first, second, and third baseband signals, respectively; delaying each of the first, second, and third baseband signals; and detecting substantially simultaneous data transitions in at least two of the first, second, and third baseband signals, and generating a reconstructed signal having a data transition in response thereto. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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21. An RFID device comprising:
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means for generating a carrier signal; means for receiving a modulated carrier signal; means for multiplying the received modulated carrier signal and first, second, and third phase-shifted carrier signals and generating first, second, and third baseband signals, respectively; means for generating clock-synchronized first, second and third baseband signals, respectively; and means for detecting substantially simultaneous data transitions in at least two of the first, second, and third baseband signals, and generating a reconstructed signal having a data transition in response thereto. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28)
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Specification