Broadcom Europe Limited

Innovision Research & Technology Plc

Broadcom Innovision Limited

Paul Butler

Joakim Bangs

Robin Wilson

David John Miles

A near field RF communicator has an inductive coupler to couple inductively to an H field of an RF signal from another near field RF communicator in near field range to provide a received signal, a demodulator coupled to extract any modulation from a source signal representing a received RF signal to provide an extracted modulation signal; and a controller coupled to receive an extracted modulation signal from the demodulator. The demodulator has a sampler to sample the source signal in sampling periods and to compare signal samples with at least one of other signal samples and a clock or reference signal to remove or reject the carrier of the received RF signal and to extract the modulation.

Near field communicator implementing switched circuit states for demodulation

A near field RF communicator has an antenna circuit to couple with the H field of an RF magnetic field and a power supply deriver to derive a rectified auxiliary power supply from the received magnetic field. Rectification may be performed using an actively switched rectifier having a passive mode of operation. A sub regulation system is provided to regulate the auxiliary power supply to inhibit the possibility of temporally varying power requirements of the near field RF communicator or its host causing an apparent load modulation of a signal that is transmitted or received by the communicator.

Near field communications (NFC) device power harvesting and power supply selection

A NFC enabled device to couple inductively to the H field of an RF signal and a regulator to regulate a voltage derived from an RF signal inductively coupled to the inductive coupler. The regulator has at least one voltage controlled impedance having a switch on voltage. A regulator controller provides a control voltage to each voltage controlled impedance such as that the control voltage is not less than the switch on voltage of the voltage controlled impedance.

Voltage regulation of near field communication communicators

A near field RF communicator has an antenna circuit () to couple with the H field of an RF magnetic field and a power supply deriver () to derive a rectified auxiliary power supply from the received magnetic field. Rectification may be performed using an actively switched rectifier () having a passive mode of operation. A sub regulation system () is provided to regulate the auxiliary power supply to inhibit the possibility of temporally varying power requirements of the near field RF communicator or its host causing an apparent load modulation of a signal that is transmitted or received by the communicator.

A near field RF communicator has an inductive coupler () to couple inductively to an H field of an RF signal from another near field RF communicator in near field range to provide a received signal, a demodulator () coupled to extract any modulation from a source signal representing a received RF signal to provide an extracted modulation signal; and a controller () coupled to receive an extracted modulation signal from the demodulator. The demodulator () has a sampler () to sample the source signal in sampling periods and to compare signal samples with at least one of other signal samples and a clock or reference signal to remove or reject the carrier of the received RF signal and to extract the modulation.

Near field RF communicators

A near field RF communicator has an antenna circuit (coupled to an active switched rectifier () to rectify a received RF magnetic field signal. The active switched rectifier also has a passive mode of operation. A switching mechanism in the forward conducting arms of the rectifier is controlled by a comparator (). A switching mechanism to control ground clamping of each respective input from the antenna circuit is provided by a coupling to the other respective input from the antenna circuit.

Growing community of inventors

Chippenham, United Kingdom

Paul Butler