Homodyne single mixer receiver and method therefor
First Claim
Patent Images
1. An RFID circuit, comprising:
- an RF carrier signal source;
a hybrid coupled to the RF carrier signal source operable to generate an in-phase and a quadrature phase component of the RF carrier signal;
a switch coupled to the hybrid operable to pass one of the in-phase and quadrature phase components of the RF carrier signal to its output; and
a mixer coupled to the output of the switch operable to multiply one of the in-phase and quadrature phase component of the carrier signal and a received modulated carrier signal and generate a baseband signal.
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Abstract
An RFID circuit comprises an RF carrier signal source, a hybrid coupled to the RF carrier signal source operable to generate an in-phase and a quadrature phase component of the RF carrier signal, a switch coupled to the hybrid operable to pass one of the in-phase and quadrature phase components of the RF carrier signal to its output, and a mixer coupled to the output of the switch operable to multiply one of the in-phase and quadrature phase component of the carrier signal and a received modulated carrier signal and generate a baseband signal.
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Citations
29 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 an in-phase and a quadrature phase component of the RF carrier signal;
a switch coupled to the hybrid operable to pass one of the in-phase and quadrature phase components of the RF carrier signal to its output; and
a mixer coupled to the output of the switch operable to multiply one of the in-phase and quadrature phase component of the carrier signal and a received modulated carrier signal and generate a baseband signal. - View Dependent Claims (2, 3, 4, 5, 6)
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7. 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 an in-phase and a quadrature phase component of the RF carrier signal;
an RF switch coupled to the hybrid operable to pass one of the in-phase and quadrature phase components of the RF carrier signal to its output;
a mixer coupled to the output of the switch operable to multiply one of the in-phase and quadrature phase component of the carrier signal and a received modulated carrier signal and generate a baseband signal; and
a processor operable to generate a control signal to the RF switch for selectively passing one of the in-phase and quadrature phase components of the RF carrier signal to the mixer. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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14. A circuit, comprising:
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a carrier signal source;
a mixer operable to selectively multiply one of an in-phase and quadrature phase component of the carrier signal and a received modulated carrier signal and generate a baseband signal for demodulation and decoding. - View Dependent Claims (15, 16, 17, 18, 19)
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20. A method comprising:
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generating a carrier signal;
receiving a modulated carrier signal;
multiplying the modulated carrier signal and an in-phase phase component of the carrier signal and generating a baseband signal;
demodulating the baseband signal;
decoding the demodulated baseband signal; and
repeating the above steps and multiplying using a quadrature phase component of the carrier signal in response to the decoded signal being invalid. - View Dependent Claims (21, 22, 23, 24)
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25. A method comprising:
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generating a carrier signal;
modulating the carrier signal and transmitting the modulated carrier signal;
receiving a backscattered modulated carrier signal;
multiplying the backscattered modulated carrier signal and an in-phase phase component of the carrier signal and generating a baseband signal;
demodulating the baseband signal;
decoding the demodulated baseband signal;
determining validity of the decoded signal; and
in response to the decoded signal being invalid, repeating the above steps and multiplying the received backscattered modulated carrier signal using a quadrature phase component of the carrier signal to generate a valid decoded signal.
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26. A method comprising:
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in a polling cycle;
generating a carrier signal;
modulating the carrier signal with an information signal and generating a query signal;
receiving a backscattered modulated carrier signal in response to the query signal;
multiplying the backscattered modulated carrier signal and an in-phase phase component of the carrier signal and generating a baseband signal;
demodulating the baseband signal;
decoding the demodulated baseband signal;
in response to an invalid decoded signal;
in a next polling cycle;
generating the carrier signal;
modulating the carrier signal with the information signal and generating a second query signal;
receiving a second backscattered modulated carrier signal in response to the second query signal;
multiplying the backscattered modulated carrier signal and a quadrature phase component of the carrier signal and generating a second baseband signal;
demodulating the second baseband signal; and
decoding the demodulated second baseband signal and generating a valid decoded signal.
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27. 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 modulated carrier signal and an in-phase phase component of the carrier signal and generating a baseband signal;
means for demodulating the baseband signal;
means for decoding the demodulated baseband signal; and
means for repeating the above steps and multiplying using a quadrature phase component of the carrier signal in response to the decoded signal being invalid.
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28. A method comprising:
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generating a carrier signal;
receiving a modulated carrier signal;
generating an in-phase component of the received modulated carrier signal;
multiplying the modulated received in-phase component of the carrier signal and the carrier signal and generating a baseband signal;
demodulating the baseband signal;
decoding the demodulated baseband signal; and
repeating the above steps and multiplying using a quadrature phase component of the received modulated carrier signal in response to the decoded signal being invalid. - View Dependent Claims (29)
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Specification