Abstract: A wireless power transfer device including a first power amplifier configured to generate a first drive signal, a second power amplifier configured to generate a second drive signal, a first transmitter coil configured to generate a first magnetic field having a first magnitude in response to receiving the first drive signal, and a second transmitter coil configured to generate a second magnetic field having a second magnitude in response to receiving the second drive signal. The wireless power transfer device also includes a repeater coil magnetically coupled to the first transmitter coil and the second transmitter coil, and configured to generate a third magnetic field having a third magnitude. The third magnitude is greater than the first magnitude and greater than the second magnitude. The repeater coil is configured to magnetically transfer power to an external device.

Abstract: A wireless power transfer device including a first coil having a first portion, and configured to generate a magnetic field, and a second coil having a second portion. The second coil positioned with respect to the first coil such that the first portion of the first coil overlaps the second portion of the second coil in an overlap region. The wireless power transfer device also includes a power amplifier electrically coupled to one selected from a group consisting of the first coil and the second coil, and a flux concentrator aligned with the overlap region and configured to concentrate a magnetic flux of the magnetic field. The power amplifier configured to output a drive signal.

Abstract: A wireless power transfer device including a first power amplifier configured to generate a first drive signal, a second power amplifier configured to generate a second drive signal, a first transmitter coil configured to generate a first magnetic field having a first magnitude in response to receiving the first drive signal, and a second transmitter coil configured to generate a second magnetic field having a second magnitude in response to receiving the second drive signal. The wireless power transfer device also includes a repeater coil magnetically coupled to the first transmitter coil and the second transmitter coil, and configured to generate a third magnetic field having a third magnitude. The third magnitude is greater than the first magnitude and greater than the second magnitude. The repeater coil is configured to magnetically transfer power to an external device.

Abstract: A wireless power transfer device including a first coil having a first portion, and configured to generate a magnetic field, and a second coil having a second portion. The second coil positioned with respect to the first coil such that the first portion of the first coil overlaps the second portion of the second coil in an overlap region. The wireless power transfer device also includes a power amplifier electrically coupled to one selected from a group consisting of the first coil and the second coil, and a flux concentrator aligned with the overlap region and configured to concentrate a magnetic flux of the magnetic field. The power amplifier configured to output a drive signal.

Abstract: A method (200) and radio frequency amplifier circuit (100) for adjusting a gain setting of a power amplifier (102) and a gain setting of a power amplifier driver (106) that form part of the radio frequency amplifier circuit (100). The method (200) includes selecting (220) a power output value for the power amplifier and an associated constant envelope modulated radio frequency signal supplied by the power amplifier driver (106) to the power amplifier (102) and then sensing variations (240) in a power output value of the power amplifier (102). Next there is performed adjusting (250) both the gain setting of the power amplifier (102) and adjusting the gain setting of the power amplifier driver (106) in response to the sensing so that the constant envelope modulated signal is within a linear operating region of the power amplifier (102). The gain settings of the power amplifier (102) and power amplifier driver (106) are concurrently adjusted until the power output value for the power amplifier is achieved.

Abstract: A method (200) and radio frequency amplifier circuit (100) for adjusting a gain setting of a power amplifier (102) and a gain setting of a power amplifier driver (106) that form part of the radio frequency amplifier circuit (100). The method (200) includes selecting (220) a power output value for the power amplifier and an associated constant envelope modulated radio frequency signal supplied by the power amplifier driver (106) to the power amplifier (102) and then sensing variations (240) in a power output value of the power amplifier (102). Next there is performed adjusting (250) both the gain setting of the power amplifier (102) and adjusting the gain setting of the power amplifier driver (106) in response to the sensing so that the constant envelope modulated signal is within a linear operating region of the power amplifier (102). The gain settings of the power amplifier (102) and power amplifier driver (106) are concurrently adjusted until the power output value for the power amplifier is achieved.