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US 8,939,377 B2Granted
RFID device
AssigneeHynix Semiconductor Inc.
InventorHee Bok Kang
Life of this patent
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Abstract
An RFID device includes an amplification unit, a demodulator, and a modulator. The amplification unit is configured to amplify a level of a radio signal applied through an antenna, and output an amplification signal. The demodulator is configured to generate an operating voltage by rectifying and amplifying the amplification signal, demodulate the operating voltage, and generate a command signal. The modulator is configured to output a response signal, which corresponds to the command signal, to the antenna.
Claims19
A radio frequency identification (RFID) device comprising:
- an amplification circuit configured to amplify a level of a first radio signal applied through an antenna, and output an amplified radio signal;
- a demodulator configured to generate an operating voltage according to the amplified radio signal, and generate a command signal by demodulating the operating voltage;
- and
- a modulator configured to output a second radio signal, the second radio signal being generated according to a response signal corresponding to the command signal,
- wherein the demodulator comprises:
- a main amplifier configured to amplify the operating voltage with reference to a second reference voltage, and output the command signal;
- and
- an envelope level adjustment unit configured to control a level of the operating voltage according to a third reference voltage, and
- wherein the demodulator further comprises:
- a signal rectifier configured to generate the operating voltage by rectifying and amplifying the amplified radio signal;
- a second bias circuit configured to supply a constant bias voltage to a node of the operating voltage;
- and
- a second reference bias circuit configured to generate the second reference voltage having a substantially constant voltage level.
10 more elements
Dependencies are inferred from the claim text.