Methods and apparatus for implementing a power amplifier circuit assembly an uneven power splitter which feeds two power amplifiers of different amplifier classes are described. By supplying different amounts of power to different amplifier circuits having different performance curves, an overall combined amplifier performance having a relatively uniform, e.g., flat, performance curve over a wide range of frequencies is achieved. In at least some embodiments one of the amplifiers is a class B power amplifier and the other amplifier is a class C power amplifier. In some but not necessarily all embodiments a phase shift is introduced on a signal path to one of the power amplifiers to compensate for a difference in phase shifts introduced by the power amplifiers which are used in parallel.

A power amplifier includes a power splitter that splits a first signal into a second signal and a third signal, a first amplifier that amplifies the second signal within an area where the first signal has a power level greater than or equal to a first level and that outputs a fourth signal, a second amplifier that amplifies the third signal within an area where the first signal has a power level greater than or equal to a second level higher than the first level and that outputs a fifth signal, an output unit that outputs an amplified signal of the first signal, a first and a second LC parallel resonant circuit, and a choke inductor having an end to which a power supply voltage is supplied and another end connected to a node of the first and second LC parallel resonant circuits.

Apparatus and methods for a no-load-modulation power amplifier are described. No-load-modulation power amplifiers can comprise multiple amplifiers connected in parallel to amplify a signal that has been divided into parallel circuit branches. One of the amplifiers can operate as a main amplifier in a first amplification class and the remaining amplifiers can operate as peaking amplifiers in a second amplification class. The main amplifier can see essentially no modulation of its load between the power amplifier's fully-on and fully backed-off states. The power amplifiers can operate in symmetric and asymmetric modes. Improvements in bandwidth and drain efficiency over conventional Doherty amplifiers are obtained. Further improvements can be obtained by combining signals from the amplifiers with hybrid couplers.

Systems and methods related to power amplification and power supply control. A power amplification control system can include an interface configured to receive a transceiver control signal from a transceiver. The power amplification control system can include a power amplifier control component configured to generate a power amplifier control signal based on the transceiver control signal from the transceiver and a power supply control component configured to generate a power supply control signal based on the transceiver control signal from the transceiver and to generate the power supply control signal based on a local control signal from the power amplifier control component.

A first branch group circuit includes a first branch circuit receiving a first RF input signal and first control information; and a second branch circuit receiving the first input signal and second control information. Each of the first and second branch circuits includes a power amplifier. The second control information enables the second branch circuit to be switched on or off while the first branch circuit remains on. A second branch group circuit includes: a third branch circuit receiving a second RF input signal and third control information; and a fourth branch circuit receiving the second input signal and fourth control information. Each of the third and fourth branch circuits includes a power amplifier. The fourth control information enables the fourth branch circuit to be switched on or off while the third branch circuit remains on. A combiner combines output signals of the power amplifiers to produce an output signal.

A planar combiner system for use in high-power multi-component power amplifier architectures in solid-state amplifiers is realized by planar placement of a wideband, low-loss, insulated and compact asymmetric Lange coupling and Wilkinson-type combiner on a base with high thermal conductivity and electrical resistance, allowing the amplifiers to directly contact the cold plate.

Example embodiments relate to radiofrequency, RF, amplifiers and electronic devices that include RF amplifiers. One example RF amplifier includes a splitter configured to split an RF input signal received at an input of the RF amplifier into a plurality of RF signal parts. The RF amplifier also includes a plurality of Doherty amplifiers, each Doherty amplifier having a main amplifier and a peak amplifier. Each Doherty amplifier is configured to amplify a respective RF signal part and output a respective amplified RF signal part. Additionally, the RF amplifier includes a combiner. The combiner is configured to combine the amplified RF signal parts from the plurality of Doherty amplifiers into an RF output signal and output the RE output signal. The combiner includes a plurality of inputs and an output. Each input of the combiner is connected to an output of a respective Doherty amplifier among the plurality of Doherty amplifiers.

In certain aspects, a power amplification device, a power amplification system, and an operation method thereof are disclosed. The power amplification system includes a power amplification device and a control unit. The power amplification device includes a plurality of power amplification circuits, a power supply network configured to supply a power source from a plurality of power sources to the plurality of power amplification circuits, and a transformer network configured to provide an output power that matches a transmit power level. The control unit includes a memory storing code and a processor coupled to the memory. When the code is executed, the processor is configured to determine a plurality of circuit configurations for the plurality of power amplification circuits based on the transmit power level, and configure the plurality of power amplification circuits using the plurality of circuit configurations, respectively, so that the output power matches the transmit power level.

A communication device includes a power amplifier that generates power signals according to one or more operating bands of communication data, with the amplitude being driven and generated in output stages of the power amplifier. The final stage can include an output passive network that suppresses suppress an amplitude modulation-to-phase modulation (AM-PM) distortion. During a back-off power mode a bias of a capacitive unit of the output power network component can be adjusted to minimize an overall capacitance variation. An output passive network can further generate a flat-phase response between dual resonances of operation.

A communication device includes a power amplifier that generates power signals according to one or more operating bands of communication data, with the amplitude being driven and generated in output stages of the power amplifier. The final stage can include an output passive network that suppresses suppress an amplitude modulation-to-phase modulation (AM-PM) distortion. During a back-off power mode a bias of a capacitive unit of the output power network component can be adjusted to minimize an overall capacitance variation. A output passive network can further generate a flat-phase response between dual resonances of operation.