Apparatus for type-A demodulation and integrated circuit card including the same
First Claim
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1. A type-A demodulator, comprising:
- a first rectifier configured to rectify a radio frequency (RF) signal received through an antenna and output a first voltage;
a second rectifier configured to rectify the RF signal received through the antenna and output a second voltage having a different voltage level than the first voltage; and
a pause data detector configured to compare the first voltage with the second voltage and to detect received pause data.
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Abstract
A type-A demodulator comprising a first rectifier configured to rectify a radio frequency (RF) signal received through an antenna and output a first voltage, a second rectifier configured to rectify the voltage of the RF signal received through the antenna and output a second voltage having a different voltage level than the first voltage, and a pause data detector configured to compare the first voltage with the second voltage and detect received pause data.
4 Citations
20 Claims
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1. A type-A demodulator, comprising:
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a first rectifier configured to rectify a radio frequency (RF) signal received through an antenna and output a first voltage; a second rectifier configured to rectify the RF signal received through the antenna and output a second voltage having a different voltage level than the first voltage; and a pause data detector configured to compare the first voltage with the second voltage and to detect received pause data. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. An integrated circuit (IC) card, comprising:
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an antenna configured to receive a radio frequency (RF) signal from a transmitter; a demodulator configured to rectify the RF signal through two rectifiers, output a first voltage and a second voltage, respectively having different voltage levels, detect a pause period based on a first and second voltage crossing between the first and second voltages, wherein the first voltage crossing occurs when the pause period starts and the second voltage crossing occurs when the pause period ends, and output received pause data; a storage unit configured to store the received pause data; and a controller configured to control the antenna to receive the RF signal, the demodulator to perform demodulation, and the storage unit to store the pause data. - View Dependent Claims (16, 17)
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18. A type-A demodulation method, comprising:
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rectifying an RF signal received through an antenna to a first voltage and a second voltage, respectively having different voltage levels; and detecting a pause period in the RF signal based on a first and second voltage crossing between the first voltage and the second voltage, wherein the first voltage crossing corresponds to a start of the pause period and the second voltage crossing corresponds to an end of the pause period. - View Dependent Claims (19, 20)
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Specification