RFID receiver apparatus and method
First Claim
Patent Images
1. An RFID backscatter interrogator for transmitting data to an RFID tag, generating a carrier for the tag, and receiving data from the tag modulated onto the carrier, the interrogator comprising:
- a synthesizer integrated circuit including first and second RF synthesizers having respective synthesizer outputs;
circuitry configured to toggle between the first and second RF synthesizers to effect frequency hopping;
an AM/FM radio demodulator integrated circuit;
an RF mixer, coupled between the synthesizer integrated circuit and the AM/FM radio demodulator integrated circuit, and configured to mix data with a carrier frequency which the AM/FM demodulator integrated circuit is configured to demodulate; and
a single grounded-coplanar wave-guide circuit board supporting at least the synthesizer integrated circuit, the AM/FM radio demodulator integrated circuit, and the RF mixer.
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Abstract
An RFID backscatter interrogator for transmitting data to an RFID tag, generating a carrier for the tag, and receiving data from the tag modulated onto the carrier, the interrogator including a single grounded-coplanar wave-guide circuit board and at least one surface mount integrated circuit supported by the circuit board.
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Citations
52 Claims
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1. An RFID backscatter interrogator for transmitting data to an RFID tag, generating a carrier for the tag, and receiving data from the tag modulated onto the carrier, the interrogator comprising:
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a synthesizer integrated circuit including first and second RF synthesizers having respective synthesizer outputs;
circuitry configured to toggle between the first and second RF synthesizers to effect frequency hopping;
an AM/FM radio demodulator integrated circuit;
an RF mixer, coupled between the synthesizer integrated circuit and the AM/FM radio demodulator integrated circuit, and configured to mix data with a carrier frequency which the AM/FM demodulator integrated circuit is configured to demodulate; and
a single grounded-coplanar wave-guide circuit board supporting at least the synthesizer integrated circuit, the AM/FM radio demodulator integrated circuit, and the RF mixer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An RFID backscatter interrogator for transmitting data to an RFID tag, generating a carrier for the tag, and receiving data from the tag modulated onto the carrier, the interrogator comprising:
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a transmitter including;
a synthesizer integrated circuit including first and second RF synthesizers having respective synthesizer outputs;
at least one RF switch coupled to the synthesizer integrated circuit; and
at least one RF power amplifier coupled to the RF switch, wherein a transmitter is defined comprising the synthesizer integrated circuit, RF switch, and RF power amplifier, the power amplifier defining a local oscillator; and
a receiver including;
a low noise amplifier;
circuitry coupled to the local oscillator defined by the power amplifier and configured to cancel a carrier from a signal received by the low noise amplifier;
an AM/FM radio demodulator integrated circuit; and
an RF mixer, coupled between the synthesizer integrated circuit and the AM/FM radio demodulator integrated circuit, and configured to mix data with a carrier frequency which the AM/FM demodulator integrated circuit is configured to demodulate. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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20. An RFID backscatter interrogator for transmitting data to an RFID tag, generating a carrier for the tag, and receiving data from the tag modulated onto the carrier, the interrogator comprising:
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a synthesizer integrated circuit including first and second RF synthesizers having respective synthesizer outputs;
an AM/FM radio demodulator integrated circuit; and
an RF mixer, coupled between the synthesizer integrated circuit and the AM/FM radio demodulator integrated circuit, and configured to mix data with a carrier frequency which the AM/FM demodulator integrated circuit is configured to demodulate. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27)
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28. An RFID backscatter interrogator for transmitting data to an RFID tag, generating a carrier for the tag, and receiving data from the tag modulated onto the carrier, the interrogator comprising:
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a synthesizer integrated circuit including first and second RF synthesizers having respective synthesizer outputs;
circuitry configured to toggle between the first and second RF synthesizers to effect frequency hopping; and
a single grounded-coplanar wave-guide circuit board supporting at least the synthesizer integrated circuit, the AM/FM radio demodulator integrated circuit, and the RF mixer. - View Dependent Claims (29, 30, 31, 32, 33, 34)
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35. An RFID backscatter system comprising:
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an interrogator for transmitting data to an RFID tag, generating a carrier for the tag, and receiving data from the tag modulated onto the carrier, the interrogator comprising a single grounded-coplanar wave-guide circuit board, a synthesizer integrated circuit supported by the circuit board, the synthesizer being configured for frequency hopping, a demodulator integrated circuit supported by the circuit board, and an RF mixer supported by the circuit board, coupled between the synthesizer integrated circuit and the demodulated integrated circuit, and configured to mix data with a carrier frequency which the demodulator integrated circuit is configured to demodulate; and
a tag in selective backscatter communication with the interrogator. - View Dependent Claims (36)
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37. A dual band RFID backscatter interrogator for transmitting data to an RFID tag, generating a carrier for the tag, and receiving data from the tag modulated onto the carrier, the interrogator comprising:
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a transmitter including;
a synthesizer integrated circuit including first and second RF synthesizers having respective synthesizer outputs;
a first section configured for transmission at a first frequency, including;
at least one RF switch switchably coupled to the synthesizer integrated circuit; and
at least one RF power amplifier coupled to the RF switch, wherein a transmitter is selectively defined including the synthesizer integrated circuit, RF switch, and RF power amplifier;
a second section configured for transmission at a second frequency different from the first frequency, including;
at least one RF switch switchably coupled to the synthesizer integrated circuit; and
at least one RF power amplifier coupled to the RF switch of the second section, wherein a transmitter is selectively defined including the synthesizer integrated circuit, RF switch of the second section, and RF power amplifier of the second section; and
a receiver including;
a third section configured for receiving backscatter at the first frequency, including;
a low noise amplifier;
circuitry coupled to the at least one power amplifier of the first section and configured to cancel a carrier from a signal received by the low noise amplifier;
an AM/FM radio demodulator integrated circuit; and
an RF mixer, coupled between the synthesizer integrated circuit and the AM/FM radio demodulator integrated circuit, and configured to mix data with a carrier frequency which the AM/FM demodulator integrated circuit is configured to demodulate; and
a fourth section configured for receiving backscatter at the second frequency, including;
a low noise amplifier;
circuitry coupled to the at least one power amplifier of the second section and configured to cancel a carrier from a signal received by the low noise amplifier of the fourth section;
an AM/FM radio demodulator integrated circuit; and
an RF mixer, coupled between the synthesizer integrated circuit and the AM/FM radio demodulator integrated circuit of the fourth section, and configured to mix data with a carrier frequency which the AM/FM demodulator integrated circuit of the fourth section is configured to demodulate. - View Dependent Claims (38, 39, 40, 41, 42, 43, 44, 45)
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46. A dual band RFID backscatter interrogator for transmitting data to an RFID tag, generating a carrier for the tag, and receiving data from the tag modulated onto the carrier, the interrogator comprising:
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a transmitter including;
a synthesizer integrated circuit including first and second RF synthesizers having respective synthesizer outputs and used in operation for communication in a selected one of at least first and second RF bands;
at least one RF switch coupled to the synthesizer integrated circuit; and
at least one RF power amplifier coupled to the RF switch, wherein a transmitter is defined comprising the synthesizer integrated circuit, RF switch, and RF power amplifier; and
a receiver including;
a low noise amplifier;
circuitry coupled to the at least one power amplifier and configured to cancel a carrier from a signal received by the low noise amplifier;
an AM/FM radio demodulator integrated circuit; and
an RF mixer, coupled between the synthesizer integrated circuit and the AM/FM radio demodulator integrated circuit, and configured to mix data with a carrier frequency which the AM/FM demodulator integrated circuit is configured to demodulate;
wherein the at least one RF switch, at least one RF power amplifier, low noise amplifier, circuitry configured to cancel a carrier, RF mixer, and AM/FM demodulator are broadbanded to cover the at least first and second bands. - View Dependent Claims (47, 48, 49, 50, 51, 52)
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Specification