Power adaptive dual mode card emulation system for NFC and RFID application
First Claim
1. A near field communication device comprising:
- an antenna to receive a carrier signal from a proximity coupling device;
a passive load modulation module;
an active load modulation module comprising a power amplifier to deliver an amplified output signal synchronized with the carrier signal back to the proximity coupling device, the amplified output signal has an amplification level adjustable according to the signal strength of the received carrier signal; and
an automatic power control module coupling to the antenna, the active load modulation module, and the passive load modulation modules, the automatic power control module selectably enabling the active load modulation module or passive load modulation module depending on signal strength of the received carrier signal.
1 Assignment
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Accused Products
Abstract
An adaptive dual mode card emulation system (in Card Emulation Mode or PICC design) within an NFC device is disclosed to solve the strong field power delivering issue and also achieve longer communication range. The NFC device may be a NFC tag or an electronic device (such as a smartphone) operated in a card emulation mode. The NFC device comprises an antenna used for wireless communication. The adaptive dual mode card emulation system comprises a passive load modulation (PLM) module, an active load modulation (ALM) module and an automatic power control (APC) module. The APC module couples to both the ALM and PLM modules and selectably enables the ALM or PLM module depending on the strength of received carrier signal sent from an NFC reader.
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Citations
17 Claims
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1. A near field communication device comprising:
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an antenna to receive a carrier signal from a proximity coupling device; a passive load modulation module; an active load modulation module comprising a power amplifier to deliver an amplified output signal synchronized with the carrier signal back to the proximity coupling device, the amplified output signal has an amplification level adjustable according to the signal strength of the received carrier signal; and an automatic power control module coupling to the antenna, the active load modulation module, and the passive load modulation modules, the automatic power control module selectably enabling the active load modulation module or passive load modulation module depending on signal strength of the received carrier signal. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for near field communication, the method comprising:
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receiving, at an antenna within a near field communication device, a carrier signal from a proximity coupling device; enabling a voltage limiting module to shunt excessive voltage when a voltage across the antenna is above a triggering voltage, the triggering voltage is adjustable corresponding to the selection of the active load modulation module or the passive load modulation module; detecting a signal strength of the carrier signal; and selectably enabling an active load modulation module or a passive load modulation module within the near field communication device based at least on the detected signal strength. - View Dependent Claims (9, 10, 11, 12, 13)
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14. A near field communication device comprising:
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an antenna to receive a carrier signal from a reader; an automatic power control module coupling to the antenna to detect signal strength of the received carrier signal; a modulator receiving a transmitting signal comprising binary bits from a baseband and a recovery clock signal extracted from the received carrier signal, the modulator outputting a modulated signal based at least on the transmitting signal and the recovery clock signal; a power amplifier to amplify the modulated signal for transmission from the antenna, the power amplifier being enabled when the detected signal strength is below a threshold; and a voltage limiting module coupled to the power amplifier and the automatic power control module, the voltage limiting module being enabled to trim excessive voltage when the amplified modulated signal is above a triggering voltage. - View Dependent Claims (15, 16, 17)
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Specification