Abstract: Circuitry, which includes a first switching transistor element having a first gate, a second switching transistor element having a second gate, a third switching transistor element having a third gate, and a fourth switching transistor element having a fourth gate, is disclosed. The first switching transistor element and the third switching transistor element are coupled in series between a first power source and a first downstream circuit. The second switching transistor element and the fourth switching transistor element are coupled in series between a second power source and the first downstream circuit. A voltage swing at the first gate and a voltage swing at the second gate are both about equal to a first voltage magnitude. A voltage swing at the third gate and a voltage swing at the fourth gate are both about equal to a second voltage magnitude.

Abstract: A parallel amplifier and a parallel amplifier power supply are disclosed. The parallel amplifier power supply provides a parallel amplifier power supply signal, which is adjustable on a communications slot-to-communications slot basis. During envelope tracking, the parallel amplifier regulates an envelope power supply voltage based on the parallel amplifier power supply signal.

Abstract: A parallel amplifier and an offset capacitance voltage control loop are disclosed. The parallel amplifier has a parallel amplifier output, which is coupled to an envelope tracking power supply output via an offset capacitive element. The offset capacitive element has an offset capacitive voltage. The offset capacitance voltage control loop regulates the offset capacitive voltage, which is adjustable on a communications slot-to-communications slot basis.

Abstract: Circuitry, which includes a first switching transistor element having a first gate, a second switching transistor element having a second gate, a third switching transistor element having a third gate, and a fourth switching transistor element having a fourth gate, is disclosed. The first switching transistor element and the third switching transistor element are coupled in series between a first power source and a first downstream circuit. The second switching transistor element and the fourth switching transistor element are coupled in series between a second power source and the first downstream circuit. A voltage swing at the first gate and a voltage swing at the second gate are both about equal to a first voltage magnitude. A voltage swing at the third gate and a voltage swing at the fourth gate are both about equal to a second voltage magnitude.

Abstract: A voltage regulator including a high-speed feedback loop operating to provide rapid settling time and a large Power Supply Rejection Ratio (PSRR). The high-speed feedback loop includes a reservoir capacitor that stores charge based on a charging current. The charge stored by the reservoir capacitor corresponds to a regulated voltage provided by the voltage regulator. When charge is drawn from the reservoir capacitor by a load, a dip occurs in the regulated output voltage. The high-speed feedback loop operates to restore the charge to the reservoir capacitor, thereby restoring the regulated voltage to its desired value. More specifically, when charge is drawn from the reservoir capacitor, the high-speed feedback loop operates to increase the first current, thereby restoring charge to the reservoir capacitor.