Derivation of a clock signal in a near field communication device

A near field communications (NFC) device, comprising:

• an antenna configured to receive a radio frequency (RF) signal inductively coupled onto a magnetic field;
• a rectifier configured to rectify the RF signal to provide a direct current (DC) voltage;
• a modulator configured to provide an output, the output being a first voltage when a data signal is at a first level or a second voltage when the data signal is at a second level;
• and
• a regulator, having an impedance, configured to regulate and to load modulate the RF signal by adjusting the impedance based upon a comparison of the DC voltage with the output of the modulator.

A near field communications (NFC) device, comprising:

• an antenna configured to receive a radio frequency (RF) signal inductively coupled onto a magnetic field;
• a rectifier configured to rectify the RF signal to provide a direct current (DC) voltage;
• a modulator configured to provide an output, the output being a first voltage when a data signal is at a first level and a second voltage when the data signal is at a second level;
• and
• a regulator configured to load modulate the RF signal to the first voltage or to the second voltage based upon the output of the modulation.

A method for regulating and load modulating by a near field communications (NFC) device, comprising:

• (a) receiving, by the NFC device, a radio frequency (RF) signal inductively coupled onto a magnetic field;
• (b) rectifying, by the NFC device, the RF signal to provide a direct current (DC) voltage;
• (c) providing, by the NFC device, an output, the output being a first voltage when a data signal is at a first level or a second voltage when the data signal is at a second level;
• (d) load modulating, by the NFC device, the data signal at the first voltage and at the second voltage.