An amplification unit 1 has an output connector 3 for outputting an RF signal output by an amplification circuit 2 for each amplification circuit. The output connectors 3 are disposed so as to be arranged in the horizontal direction. A combining unit 5 has an input connector 6 into which the RF signal output from the output connector 3 of the amplification unit 1 is input for each output connector 3. The input connectors are disposed so as to be arranged in the horizontal direction. The amplification unit 1 and the combining unit 5 are attachable/detachable through the output connectors 3 and the input connectors 6. The surface on which the input connectors are provided of the combining unit 5 is set within the dimension of the surface on which the output connectors are provided of the amplification unit 1.

A power amplification device capable of detaching an element relating to the power amplification of an RF signal from an element relating to the combining of RF signals. The amplifying unit 1 is provided with a plurality of groups of amplifier circuits 2 that amplifies the power of a RF signal and the plurality of groups of amplifier circuits each includes a predetermined number of the amplifier circuits 2. A combining unit 5 includes a first combiner 7 and a second combiner 8. The first combiner 7 is provided in association with the group of the amplifier circuits 2, combines RF signals output from the amplifier circuits 2 belonging to the corresponding group, and outputs the RF signal after combining. The second combiner 8 combines the RF signals output from each first combiner 7 and outputs the RF signal after combining. Each first combiner 7 is a combiner usable for an RF signal in a specific frequency band. The amplifying unit 1 is attachable to and detachable from the combining unit 5.

Embodiments of a Doherty amplifier device are provided, where the device includes a main amplifier that produces a first RF signal with a variable first output power and a peaking amplifier that produces a second RF signal with a variable second output power equivalent to the first output power multiplied by a power ratio n greater than one; first and second RF signals combined in phase at a combining node; and a main output matching network (OMN), wherein the main OMN forms a portion of an equivalent main path transmission line having a characteristic impedance equivalent to (n+1).Math.{square root over (Ropt.Math.R0)}, wherein Ropt is a load impedance seen at the main amplifier intrinsic current generator plane during a full power condition of the Doherty amplifier device and (n+1).Math.R0 is a load impedance seen at the combining node during a back-off power condition of the Doherty amplifier device.

Embodiments of a Doherty amplifier device are provided, where the device includes a main amplifier that produces a first RF signal with a variable first output power and a peaking amplifier that produces a second RF signal with a variable second output power equivalent to the first output power multiplied by a power ratio n greater than one; first and second RF signals combined in phase at a combining node; and a main output matching network (OMN), wherein the main OMN forms a portion of an equivalent main path transmission line having a characteristic impedance equivalent to $\sqrt{\left(n+1\right).Math.\mathrm{Ropt}.Math.R0},$
wherein Ropt is a load impedance seen at the main amplifier intrinsic current generator plane during a full power condition of the Doherty amplifier device and R0 is a load impedance seen at the combining node during a back-off power condition of the Doherty amplifier device.

The embodiments herein relate to a power amplifier arrangement (100) comprising a main amplifier (101) comprising an output connected to a first terminal (110) of a primary winding (105) of a transformer (125). A second terminal (113) of the primary winding (105) is connected to ground (115). The power amplifier arrangement (100) comprises an auxiliary amplifier (103) comprising an output connected to a first terminal (120) of a secondary winding (108) of the transformer (125). A second terminal (118) of the secondary winding (108) is connected to a load (130).

An amplifier comprising a main branch amplifier and an auxiliary branch amplifier, wherein one branch is a constant current-biased branch, and another branch is a voltage biased branch, with the branches connected in cascode configuration to form a load modulated amplifier.

Existing multi-band/multi-mode (MB/MM) power amplifiers (PAs) use separate signal paths for the different covered frequency bands. This results in a large degree of hardware duplication and to a large die size and cost. Solutions that achieve hardware sharing between the different signal paths of MB/MM PAs are shown. Such sharing includes bias circuit and bypass capacitors sharing, as well as sharing front-end stages and the output stage of the PA. Signal multiplexing may be realized in the transmitter or at the PA front-end while the signal de-multiplexing can be realized either in the PA output stage or at the front-end of the output stage. Such circuits can be applied with saturated and linear MB/MM PAs with adjacent or non-adjacent bands.

A power amplifier circuit includes a first amplifier that, in a region where an input signal level is a first level or higher, amplifies a signal split from an input signal and outputs an amplified signal; a first converter connected to an output side of the first amplifier and converts an impedance on the output side of the first amplifier; and at least one or more second amplifiers that, in a region where the input signal level is a second level or higher, amplify a signal split from the input signal and output an amplified signal. Output sides of the second amplifiers are connected in series with an output side of the first converter.

A harmonic processing circuit includes: a feeder line configured to feed power to an amplifying device; and a harmonic processing unit connected to the feeder line, and configured to perform harmonic processing to a harmonic of a signal outputted from the amplifying device. The feeder line is connected to a fundamental wave matching circuit that is connected to the amplifying device and performs matching with respect to a fundamental wave of the signal.

A harmonic processing circuit includes: a feeder line configured to feed power to an amplifying device; and a harmonic processing unit connected to the feeder line, and configured to perform harmonic processing to a harmonic of a signal outputted from the amplifying device. The feeder line is connected to a fundamental wave matching circuit that is connected to the amplifying device and performs matching with respect to a fundamental wave of the signal.