Reducing emissions in a near field communications (NFC) capable device
AssigneeBroadcom Corporation
InventorsRobin Wyndham John Wilson, Philip Dorning
Life of this patent
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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.
Claims18
A near field communications (NFC) device, comprising:
- an antenna circuit configured to receive a communications signal to provide a recovered communications signal, the antenna circuit being tuned to receive the communications signal;
- and
- near field operational components configured to recover information from the recovered communications signal, the near field operational components comprising:
- a rectifier configured to rectify the recovered communications signal to provide a rectified output;
- and
- a regulator configured to detune the antenna circuit to regulate a power level of the recovered communications signal when the rectified output is greater than a reference voltage.
A method for regulating a power level of a recovered communications signal, the method comprising,
- receiving, by a near field communications (NFC) device, a communications signal to provide the recovered communications signal, the NFC device being tuned to receive the communications signal;
- rectifying the recovered communications signal to provide a rectified output;
- and
- detuning the NFC device to regulate the power level of the recovered communications signal when the rectified output is greater than a reference voltage.
Dependencies are inferred from the claim text.