Abstract: Wireless charging methods, chargers and devices are disclosed, including a method of measuring wireless charging performance comprising transmitting a wireless charging signal, measuring a transmitted power of the wireless charging signal, receiving an indication of a received power from the wireless charging signal received by a device, and determining wireless charging performance based on the transmitted power and the indication of the received power.

Abstract: A receiver circuit and a device incorporating a receiver circuit are described, including a receiver circuit comprising a first rectifier arranged to receive a signal from an antenna, a second rectifier arranged to receive the signal from the antenna, and a first depletion mode NMOS transistor switch connected between the first rectifier and a first output of the receiver circuit, wherein a drain of the first transistor switch is connected to a first output of the first rectifier, a source of the first transistor switch comprises the first output of the receiver circuit, and a gate of the first transistor switch is arranged to receive a voltage based on an output of the second rectifier, such that the transistor switch is opened when a level of the signal from the antenna exceeds a predetermined level.

Abstract: An inductor structure includes a first inductor and a second inductor. The second inductor includes a loop that surrounds the first inductor. The first inductor includes a first loop and a second loop, and a crossover section coupling the first loop to the second loop so as to cause current flowing through the first inductor to circulate around the first loop in a first rotational direction and around the second loop in a second rotational direction opposite to the first rotational direction; wherein the first and second inductors are arranged in an equilibrated configuration about a first axis that bisects the inductor structure such that the first loop is on one side of the first axis and the second loop is on a second side of the first axis, such that the magnetic interaction between the inductors due to current flow in the inductors is cancelled out.

Abstract: Methods and devices are described, including a near-field communications (NFC) or radio frequency identification (RFID) device comprising an NFC or RFID circuit, an antenna having at least a first terminal, a first rectifier connected to the first terminal of the antenna, a switch between the first rectifier and the NFC or RFID circuit, a voltage detector for detecting a voltage in the device caused by a signal received at the antenna, and a control module for controlling the switch, wherein when the voltage exceeds a threshold magnitude, the control module controls the switch to be in an open state and, after a predetermined time period, determines whether the voltage still exceeds the threshold magnitude and, if the voltage still exceeds the predetermined magnitude, controls the switch to be in the open state.

Abstract: A receiver circuit and a device incorporating a receiver circuit are described, including a receiver circuit comprising a first rectifier arranged to receive a signal from an antenna, a second rectifier arranged to receive the signal from the antenna, and a first depletion mode NMOS transistor switch connected between the first rectifier and a first output of the receiver circuit, wherein a drain of the first transistor switch is connected to a first output of the first rectifier, a source of the first transistor switch comprises the first output of the receiver circuit, and a gate of the first transistor switch is arranged to receive a voltage based on an output of the second rectifier, such that the transistor switch is opened when a level of the signal from the antenna exceeds a predetermined level.

Abstract: Methods and devices are disclosed including a wireless charging method comprising transmitting a wireless charging signal, monitoring at least one of an amplitude and a phase of the wireless charging signal, determining whether the at least one of an amplitude and phase is within a predetermined range of at least one predetermined value and, if it is determined that the at least one of an amplitude and phase is not within the predetermined range of the at least one predetermined value, stopping transmission of the wireless charging signal.

Abstract: Methods and devices are disclosed, including a method of communicating, the method comprising transmitting, in a first time period, a signal for powering a communications device, and communicating, in a second time period, with the communications device using one of phase shift keying (PSK), frequency shift keying (FSK) and quadrature amplitude modulation (QAM).

Abstract: Methods and devices are disclosed including a wireless charging method comprising transmitting a wireless charging signal, monitoring at least one of an amplitude and a phase of the wireless charging signal, determining whether the at least one of an amplitude and phase is within a predetermined range of at least one predetermined value and, if it is determined that the at least one of an amplitude and phase is not within the predetermined range of the at least one predetermined value, stopping transmission of the wireless charging signal.

Abstract: Wireless charging methods, chargers and devices are disclosed, including a method of measuring wireless charging performance comprising transmitting a wireless charging signal, measuring a transmitted power of the wireless charging signal, receiving an indication of a received power from the wireless charging signal received by a device, and determining wireless charging performance based on the transmitted power and the indication of the received power.

Abstract: Wireless charging methods and apparatus are disclosed, including a wireless charging method comprising transmitting a wireless charging signal using an antenna, determining an indication of power being transferred to at least one device being charged by the wireless charging signal, adjusting an impedance of the antenna to increase the power being transferred.

Abstract: Methods and devices are described, including a near-field communications (NFC) or radio frequency identification (RFID) device comprising an NFC or RFID circuit, an antenna having at least a first terminal, a first rectifier connected to the first terminal of the antenna, a switch between the first rectifier and the NFC or RFID circuit, a voltage detector for detecting a voltage in the device caused by a signal received at the antenna, and a control module for controlling the switch, wherein when the voltage exceeds a threshold magnitude, the control module controls the switch to be in an open state and, after a predetermined time period, determines whether the voltage still exceeds the threshold magnitude and, if the voltage still exceeds the predetermined magnitude, controls the switch to be in the open state.

Abstract: Methods and devices are disclosed, including a method of communicating, the method comprising transmitting, in a first time period, a signal for powering a communications device, and communicating, in a second time period, with the communications device using one of phase shift keying (PSK), frequency shift keying (FSK) and quadrature amplitude modulation (QAM).

Abstract: An inductor structure includes a first inductor and a second inductor. The second inductor includes a loop that surrounds the first inductor. The first inductor includes a first loop and a second loop, and a crossover section coupling the first loop to the second loop so as to cause current flowing through the first inductor to circulate around the first loop in a first rotational direction and around the second loop in a second rotational direction opposite to the first rotational direction; wherein the first and second inductors are arranged in an equilibrated configuration about a first axis that bisects the inductor structure such that the first loop is on one side of the first axis and the second loop is on a second side of the first axis, such that the magnetic interaction between the inductors due to current flow in the inductors is cancelled out.

Abstract: An inductor structure includes a first inductor and a second inductor. The second inductor includes a loop that surrounds the first inductor. The first inductor includes a first loop and a second loop, and a crossover section coupling the first loop to the second loop so as to cause current flowing through the first inductor to circulate around the first loop in a first rotational direction and around the second loop in a second rotational direction opposite to the first rotational direction; wherein the first and second inductors are arranged in an equilibrated configuration about a first axis that bisects the inductor structure such that the first loop is on one side of the first axis and the second loop is on a second side of the first axis, such that the magnetic interaction between the inductors due to current flow in the inductors is cancelled out.

Abstract: An amplifier (22) containing an arrangement of capacitive elements (26, 28) in place of a source degeneration inductor arrangement to set the real part of the amplifier's input impedance.

Abstract: An inductor structure includes a first inductor and a second inductor. The second inductor includes a loop that surrounds the first inductor. The first inductor includes a first loop and a second loop, and a crossover section coupling the first loop to the second loop so as to cause current flowing through the first inductor to circulate around the first loop in a first rotational direction and around the second loop in a second rotational direction opposite to the first rotational direction; wherein the first and second inductors are arranged in an equilibrated configuration about a first axis that bisects the inductor structure such that the first loop is on one side of the first axis and the second loop is on a second side of the first axis, such that the magnetic interaction between the inductors due to current flow in the inductors is cancelled out.