Reducing emissions in a near field communications (NFC) capable device
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United States of America Patent
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Nov 25, 2014
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N/A
app pub date -
May 20, 2011
filing date -
May 20, 2010
priority date (Note) -
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Abstract
A near field communications (NFC) device is disclosed that interacts with other NFC devices to exchange information and/or the data. Another NFC device inductively couples a received communications signal onto an antenna circuit of the NFC device to provide a recovered communications signal. An overvoltage protection module regulates a power level of the recovered communication signal by detuning the antenna circuit when the power level of the recovered communication signal may cause damage the NFC device. Active components of the overvoltage protection module, such as voltage controlled impedances, operate in their linear mode of operation to reduce unwanted emissions during this regulation process.
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