Demodulators for near field communication, near field communication devices, and electronic devices having the same
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United States of America Patent
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Dec 6, 2016
Grant Date -
May 12, 2016
app pub date -
Jun 16, 2015
filing date -
Jun 16, 2015
priority date (Note) -
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status (Latency Note)
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Abstract
A demodulator for near field communication may include: a scale down circuit configured to receive first and second modulated signals from first and second power electrodes, and configured to provide a scale down signal to a first node by scaling down magnitudes of the first and second modulated signals; a current source coupled between the first node and a ground voltage, and configured to generate a constant current flowing from the first node to the ground voltage; a charge store circuit coupled between the first node and ground voltage, and configured to perform charge and discharge operations alternately, based on the scale down signal and constant current, to output an envelope signal, which corresponds to an envelope of the scale down signal; and/or an edge detector configured to generate input data, which correspond to the first and second modulated signals, based on a transition of the envelope signal.
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