A system may include a charge pump configured to boost an input voltage of the charge pump to an output voltage greater than the input voltage, a current mode control loop for current mode control of a power amplifier powered by the output voltage of the charge pump, and a controller configured to, in a current-limiting mode of the controller, control an output power of the charge pump to ensure that an input current of the charge pump is maintained below a current limit, control the power amplifier by placing the power amplifier into a high-impedance mode during the current-limiting mode, and control state variables of a loop filter of the current mode control loop during the current-limiting mode.

A dynamic amplifier includes an amplifier configured to differentially amplify first and second input signals to generate first and second output signals, a bias circuit, and a variable impedance circuit. The bias circuit is connected between a first power node configured to supply a first source voltage and the amplifier, and configured to apply bias to the amplifier. The variable impedance circuit is connected between the amplifier and a second power node configured to supply a second source voltage that is lower than the first source voltage. The variable impedance circuit is configured to adjust amplification gain of the amplifier, by adjusting impedance based on a magnitude of one among the first and second input signals and the first and second output signals.

Methods and systems for modulating an amplifier power supply to efficiently attain amplified RF output power with much lower power dissipation than existing amplifiers.

A power amplifier module includes a first amplifier circuit that amplifies a radio frequency signal with a first gain corresponding to a first control signal to generate a first amplified signal; a second amplifier circuit that amplifies the first amplified signal with a second gain corresponding to a second control signal to generate a second amplified signal; and a control unit that generates the first control signal and the second control signal. The second control signal is a control signal for increasing a power-supply voltage for the second amplifier circuit as a peak-to-average power ratio of the radio frequency signal increases. The first control signal is a control signal for controlling the first gain of the first amplifier circuit so that a variation in the second gain involved in a variation in the power-supply voltage for the second amplifier circuit is compensated for.

A system may include a charge pump configured to boost an input voltage of the charge pump to an output voltage greater than the input voltage, a current mode control loop for current mode control of a power amplifier powered by the output voltage of the charge pump, and a controller configured to, in a current-limiting mode of the controller, control an output power of the charge pump to ensure that an input current of the charge pump is maintained below a current limit, control the power amplifier by placing the power amplifier into a high-impedance mode during the current-limiting mode, and control state variables of a loop filter of the current mode control loop during the current-limiting mode.

A variable-gain power amplifying technique includes generating, with a network of one or more reactive components included in an oscillator, a first oscillating signal, and outputting, via one or more taps included in the network of the reactive components, a second oscillating signal. The second oscillating signal has a magnitude that is proportional to and less than the first oscillating signal. The power amplifying technique further includes selecting one of the first and second oscillating signals to use for generating a power-amplified output signal, and amplifying the selected one of the first and second oscillating signals to generate the power-amplified output signal.

A field-effect transistor system is provided that comprises a field-effect transistor having a back-gate terminal that can be adjusted by a back-gate voltage, a gate-source voltage and a drain-source voltage additionally being present at the field-effect transistor, and a drain current flowing through the field-effect transistor. In addition, the field-effect transistor system includes a control unit connected to the back-gate terminal, which unit is set up to set the drain current flowing through the field-effect transistor to a setpoint current via a controlling of the back-gate voltage at the back-gate terminal, the controlling of the back-gate voltage taking place as a function of at least the gate-source voltage. In addition, a method is provided for setting a drain current of a field-effect transistor.

Methods and systems for modulating an amplifier power supply to efficiently attain amplified RF output power with much lower power dissipation than existing amplifiers. In a cable television (CATV) network, a processor receives a signal to be amplified by an amplifier at a location remote from the processor. A bias point of the amplifier may be variably modulated based on peaks of an input signal to reduce amplifier dissipation.

A power converter may include an input for receiving an input signal and output for generating an intermediate signal that is a power converted signal from the input signal wherein the intermediate signal is determined based on various parameters of a signal path that utilizes the intermediate signal, wherein the various parameters comprise one or more of the following: a peak output signal of the signal path, energy requested over a period of time by the signal path, available energy from an energy source to the power converter, stored energy at an output of the power converter, and stored energy of a battery for providing electrical energy at the input.

A dynamic power supply (DPS) for polar modulation transmitters and envelope tracking (ET) transmitters includes a direct current (DC)-DC converter, a linear amplitude modulator (LAM) connected in series with the DC-DC converter, and a controller that dynamically controls both the switching of the DC-DC converter and the magnitude of the LAM's reference voltage, depending on time-varying changes in an input envelope voltage Venv. The DC-DC converter includes a high-power buck switching stage and an output energy storage network having a third-order or higher low-pass filter (LPF). The third-order or higher LPF filters out switching noise and ripple from the switching voltage produced by the high-power buck switching stage, and in one embodiment of the invention is augmented by a damping network that eliminates undesirable ringing at the power supply input of the LAM, thereby increasing efficiency and DPS conversion precision.