Wireless communication device
First Claim
1. A wireless communication device, comprising:
- an antenna having inductance;
a transceiver comprising a transmission electrode and a receive electrode, the transceiver configured to communicate with an external device through the antenna;
a filter circuit coupled between the transmission electrode and the antenna, the filter circuit comprising a harmonic trap circuit configured to eliminate a harmonic element of a carrier frequency of an outgoing signal provided from the transceiver through the transmission electrode; and
an attenuation circuit coupled between the receive electrode and the antenna, the attenuation circuit configured to provide an incoming signal received through the antenna to the receive electrode after reducing a voltage of the incoming signal,wherein harmonic element elimination and incoming signal voltage reduction is provided without mode selection switching between an active reader mode and a passive card mode.
1 Assignment
0 Petitions
Accused Products
Abstract
A wireless communication device includes an antenna, a transceiver, a filter circuit and an attenuation circuit. The transceiver includes a transmission electrode and a receive electrode, and communicates with an external device through the antenna. The filter circuit is coupled between the transmission electrode and the antenna, and includes a harmonic trap circuit that eliminates a harmonic element of a carrier frequency of an outgoing signal provided from the transceiver through the transmission electrode. The attenuation circuit is coupled between the receive electrode and the antenna, and provides an incoming signal received through the antenna to the receive electrode after reducing a voltage of the incoming signal.
14 Citations
20 Claims
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1. A wireless communication device, comprising:
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an antenna having inductance; a transceiver comprising a transmission electrode and a receive electrode, the transceiver configured to communicate with an external device through the antenna; a filter circuit coupled between the transmission electrode and the antenna, the filter circuit comprising a harmonic trap circuit configured to eliminate a harmonic element of a carrier frequency of an outgoing signal provided from the transceiver through the transmission electrode; and an attenuation circuit coupled between the receive electrode and the antenna, the attenuation circuit configured to provide an incoming signal received through the antenna to the receive electrode after reducing a voltage of the incoming signal, wherein harmonic element elimination and incoming signal voltage reduction is provided without mode selection switching between an active reader mode and a passive card mode. - View Dependent Claims (2, 3, 6, 7)
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4. A wireless communication device, comprising:
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an antenna having inductance; a transceiver comprising a transmission electrode and a receive electrode, the transceiver configured to communicate with an external device through the antenna; a filter circuit coupled between the transmission electrode and the antenna, the filter circuit comprising a harmonic trap circuit configured to eliminate a harmonic element of a carrier frequency of an outgoing signal provided from the transceiver through the transmission electrode; and an attenuation circuit coupled between the receive electrode and the antenna, the attenuation circuit configured to provide an incoming signal received through the antenna to the receive electrode after reducing a voltage of the incoming signal, wherein the filter circuit further comprises a first capacitor coupled between the transmission electrode and the harmonic trap circuit. - View Dependent Claims (5)
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8. A wireless communication device, comprising;
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an antenna having a inductance; a transceiver comprising a transmission electrode and a receive electrode, the transceiver configured to communicate with an external device through the antenna; a filter circuit coupled between the transmission electrode and the antenna, the filter circuit comprising a harmonic trap circuit configured to eliminate a harmonic element of a carrier frequency of an outgoing signal provided from the transceiver through the transmission electrode; and an attenuation circuit coupled between the receive electrode and the antenna, the attenuation circuit configured to provide an incoming signal received through the antenna to the receive electrode after reducing a voltage of the incoming signal, wherein the transceiver comprises a differential amplifier configured to generate the outgoing signal and to output the outgoing signal through a first transmission electrode and a second transmission electrode, and wherein the filter circuit comprises; a positive filter circuit coupled between the first transmission electrode and a first electrode of the antenna, the positive filter circuit comprising a first harmonic trap circuit that eliminates the harmonic element; and a negative filter circuit coupled between the second transmission electrode and a second electrode of the antenna, the negative filter circuit comprising a second harmonic trap circuit that eliminates the harmonic element. - View Dependent Claims (9)
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10. A wireless communication device, comprising:
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an antenna having inductance; a transceiver comprising a transmission electrode, a first receive electrode and a second receive electrode, the transceiver configured to communicate with an external device through the antenna; a filter circuit coupled between the transmission electrode and the antenna, the filter circuit configured to filter an outgoing signal provided from the transceiver through the transmission electrode and to provide the filtered outgoing signal to the antenna; and an attenuation circuit coupled between the first receive electrode, the second receive electrode and the antenna, the attenuation circuit configured to provide an incoming signal received through the antenna to the first receive electrode after reducing a voltage of the incoming signal by an amount of a first voltage in an active mode and to provide the incoming signal to the second receive electrode after reducing the voltage of the incoming signal by an amount of a second voltage, which is smaller than the first voltage, in a passive mode. - View Dependent Claims (11, 12, 13, 14)
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15. A transceiver interface for a near-field communication (NFC) apparatus, the transceiver interface comprising:
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a transmit and receive antenna; a transceiver; a transmission path coupled between a transmit electrode of the transceiver and the transmit and receive antenna; and a receiving path coupled between a receive electrode of the transceiver and the transmit and receive antenna, wherein the transmission path is configured to transmit an outgoing signal to a radio frequency identification (RFID) tag while suppressing harmonics of the outgoing signal; and wherein the receiving path is configured to receive both an incoming signal from an RFID reader and an incoming signal from the RFID tag, and to provide the receive electrode with reduced levels of both the incoming signal from an RFID reader and the incoming signal from the RFID tag, wherein the harmonic suppression of the outgoing signal and the level reduction of the incoming signal are provided without mode selection switching between an RFID reader mode and an RFID tag mode. - View Dependent Claims (17, 18, 19)
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16. A transceiver interface for a near field communication NFC) apparatus, the transceiver interface comprising:
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a transmit and receive antennas; a transceiver; a transmission path coupled between a transmit electrode of the transceiver and the transmit and receive antenna; and a receiving path coupled between a receive electrode of the transceiver and the transmit and receive antenna, wherein the transmission path is configured to transmit an outgoing signal to a radio frequency identification (RFID) tag while suppressing harmonics of the outgoing signal;
wherein the receiving path is configured to receive both an incoming signal from an RFID reader and an incoming signal from the RFID tag, and to provide the receive electrode with reduced levels of both the incoming signal from an RFID reader and the incoming signal from the RFID tag, andwherein a voltage level of the incoming signal from the RFID tag is greater than a voltage level of the incoming signal from the RFID reader.
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20. A transceiver interface for a near-field communication (NFC) apparatus, the transceiver interface comprising:
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a transmit and receive antenna; a transceiver; a transmission path coupled between a transmit electrode of the transceiver and the transmit and receive antenna; and a receiving coupled between a receive electrode of the transceiver and the transmit and receive antenna, wherein the transmission path is configured to transmit an outgoing signal to a radio frequency identification (RFID) tag while suppressing harmonics of the outgoing signal;
wherein the receiving path is configured to receive both an incoming signal from an RFID reader and an incoming signal from the RFID tag, and to provide the receive electrode with reduced levels of both the incoming signal from an RFID reader and the incoming signal from the RFID tag, andwherein the receiving path comprises an attenuation circuit having a resistance circuit configured to reduce the incoming signal from the RFID tag by an amount of a first voltage and to reduce the incoming signal from the RFID reader by an amount of a second voltage, which is smaller than the first voltage.
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Specification