Near field communications device
First Claim
Patent Images
1. A near field communication (NFC) device comprising:
- a receiving module comprising a receiver configured to receive an analog signal comprising a carrier signal and data, an analog-to-digital converter configured to convert the analog signal to a digital signal, and a filter configured to filter the digital signal; and
a transmitting module comprising a direct current-direct current (DC-DC) converter having an operating frequency belonging to a stop band of the filter, and a transmitter configured to receive power from the DC-DC converter and configured to receive a system clock signal.
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Abstract
A near field communications (NFC) device includes a receiving module and a transmitting module. The receiving module includes a receiver receiving an analog signal that includes a carrier signal and data, an analog-to-digital converter converting the analog signal to a digital signal, and a filter filtering the digital signal. The transmitting module includes a direct current-direct current (DC-DC) converter having an operating frequency belonging to a stop band of the filter, and a transmitter receiving power from the DC-DC converter and receiving a system clock signal.
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Citations
20 Claims
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1. A near field communication (NFC) device comprising:
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a receiving module comprising a receiver configured to receive an analog signal comprising a carrier signal and data, an analog-to-digital converter configured to convert the analog signal to a digital signal, and a filter configured to filter the digital signal; and a transmitting module comprising a direct current-direct current (DC-DC) converter having an operating frequency belonging to a stop band of the filter, and a transmitter configured to receive power from the DC-DC converter and configured to receive a system clock signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A near field communication (NFC) device comprising:
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a receiver configured to receive an analog signal comprising a carrier signal and data; an analog-to-digital converter configured to convert the analog signal into a digital signal; a digital filter configured to filter the digital signal in a stop band that comprises a frequency of a signal generated by dividing the carrier signal and comprises harmonic components of the frequency. - View Dependent Claims (16, 17, 18, 19)
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20. A near field communication (NFC) device comprising:
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a clock generating circuit configured to generate a system clock signal; a transmitter configured to amplify the system clock signal to generate a carrier signal; a direct current-direct current (DC-DC) converter configured to supply a power supply voltage; and a DC-DC control circuit configured to determine a control method of the DC-DC converter depending on whether an NFC tag receiving the carrier signal is present, wherein the DC-DC control circuit is configured to control the DC-DC converter according to a pulse-width modulation mode in response to detecting that the NFC tag receiving the carrier signal is present and is configured to control the DC-DC converter according to a pulse-frequency modulation mode in response to detecting that the NFC tag receiving the carrier signal is absent.
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Specification