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 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 IC, and the RF mixer.
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Accused Products
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.
104 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 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 IC, 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 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 IC, 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 and at least one surface mount integrated circuit supported by the circuit board; 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 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 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 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