Abstract: Wireless charging of electronic devices often requires active adjustment of impedance and power level during charging. Technical solutions described herein provide systems and methods for adjusting the impedance measured at the power amplifier according to the output power level. In particular, the power amplifier impedance decreases as the power output increases, and the power amplifier impedance increases as the power output decreases. In an embodiment, the impedance adjustment includes the addition of a phase shifter.

Abstract: Wireless charging of electronic devices often requires active adjustment of impedance and power level during charging. Technical solutions described herein provide systems and methods for adjusting the impedance measured at the power amplifier according to the output power level. In particular, the power amplifier impedance decreases as the power output increases, and the power amplifier impedance increases as the power output decreases. In an embodiment, the impedance adjustment includes the addition of a phase shifter.

Abstract: An architecture and method for improving efficiency of a Class-A power amplifier by dynamically scaling biasing current thereof as well as synchronously compensating gain thereof in order to maintain overall constant gain of the Class-A power amplifier at all biasing configurations thereof. A biasing-current switching-network is operatively connected to the back-end block of the Class-A power amplifier. A gain-control switching-network is operatively connected to a front-end block of the Class-A power amplifier. A detector-and-control block is operatively connected to an output of the back-end block of the Class-A power amplifier, and samples a signal that is then compared with reference signals to determine switching configurations in the biasing-current switching-network and the gain-control switching network when the signal is processed through the front-end block of the Class-A power amplifier followed by the back-end block of the Class-A power amplifier.

Abstract: An architecture and method for improving efficiency of a Class-A power amplifier by dynamically scaling biasing current thereof as well as synchronously compensating gain thereof in order to maintain overall constant gain of the Class-A power amplifier at all biasing configurations thereof. A biasing-current switching-network is operatively connected to the back-end block of the Class-A power amplifier. A gain-control switching-network is operatively connected to a front-end block of the Class-A power amplifier. A detector-and-control block is operatively connected to an output of the back-end block of the Class-A power amplifier, and samples a signal that is then compared with reference signals to determine switching configurations in the biasing-current switching-network and the gain-control switching network when the signal is processed through the front-end block of the Class-A power amplifier followed by the back-end block of the Class-A power amplifier.