A radio frequency amplifier includes a first input terminal, a second input terminal, an output terminal, and first and second amplifiers. The first amplifier includes a first amplifier input coupled to the first input terminal, and a first amplifier output. The second amplifier includes a second amplifier input coupled to the second input terminal, and a second amplifier output coupled to the output terminal by an output inductive element. An output combiner circuit is coupled between the first amplifier output and the second amplifier output. The output combiner circuit includes a first inductive element, a capacitor, and a second inductive element. The first inductive element is coupled between the first amplifier output and a first terminal of the capacitor, and the second inductive element is coupled between the second amplifier output and the first terminal of the capacitor. A second terminal of the capacitor is coupled to ground.

A radio frequency amplifier includes a first input terminal, a second input terminal, an output terminal, and first and second amplifiers. The first amplifier includes a first amplifier input coupled to the first input terminal, and a first amplifier output. The second amplifier includes a second amplifier input coupled to the second input terminal, and a second amplifier output coupled to the output terminal by an output inductive element. An output combiner circuit is coupled between the first amplifier output and the second amplifier output. The output combiner circuit includes a first inductive element, a capacitor, and a second inductive element. The first inductive element is coupled between the first amplifier output and a first terminal of the capacitor, and the second inductive element is coupled between the second amplifier output and the first terminal of the capacitor. A second terminal of the capacitor is coupled to ground.

A voltage dividing capacitor circuit includes first capacitor through third capacitor dividers and first through fourth load capacitors. The first capacitor divider includes a first flying capacitor and a plurality of first switches connected in series between a first voltage node and a ground node, and is connected to a second voltage node. The second capacitor divider is connected to the first voltage node, the second voltage node, and a first intermediate voltage node. The third capacitor divider is connected to the second voltage node, the ground voltage node, and a second intermediate voltage node. The first through fourth load capacitors are connected in series between the first voltage node and the ground node. The second capacitor divider includes a second flying capacitor and a plurality of second switches connected in series between the first voltage node and the second voltage node.

A voltage dividing capacitor circuit includes first capacitor through third capacitor dividers and first through fourth load capacitors. The first capacitor divider includes a first flying capacitor and a plurality of first switches connected in series between a first voltage node and a ground node, and is connected to a second voltage node. The second capacitor divider is connected to the first voltage node, the second voltage node, and a first intermediate voltage node. The third capacitor divider is connected to the second voltage node, the ground voltage node, and a second intermediate voltage node. The first through fourth load capacitors are connected in series between the first voltage node and the ground node. The second capacitor divider includes a second flying capacitor and a plurality of second switches connected in series between the first voltage node and the second voltage node.

A radio frequency apparatus includes a power amplifier circuit, a signal coupling circuit, an extraction circuit, and a harmonic filter circuit. The power amplifier circuit is configured to amplify a differential signal to output a to-be-filtered signal. The signal coupling circuit includes a primary side inductor and a secondary side inductor. The signal coupling circuit is configured to convert the to-be-filtered signal received by the primary side inductor into a single-ended signal outputted from the secondary side inductor. The extraction circuit has a center tap. The extraction circuit is configured to inductively couple to the primary side inductor and output a common mode signal from the center tap. The harmonic filter circuit is configured to perform a harmonic filtering on the single-ended signal according to the common mode signal, such that the secondary side inductor of the signal coupling circuit outputs a filtered signal.

Aspects of the disclosure relate to a radio frequency phase shifter. An example includes an amplification stage to produce an amplified voltage, the amplification stage having a first amplifier with a first input coupled to a first output of a hybrid coupler and a second amplifier with a complementary second input coupled to a complementary second output of the hybrid coupler. A vector modulation stage coupled to the amplification stage receives the amplified voltage and produces a modulated vector, the vector modulation stage has an in-phase section and a quadrature section to control the phase of the modulated vector in response to a phase control signal. A varactor coupled across the first input and the second input of the amplification stage adjusts the capacitance between the first input and the second input in response to a capacitance control signal.

A power amplifying circuit includes a first input terminal applied with a first bias voltage, a first amplifying circuit generating a first output signal and a second output signal according to an input signal and a first matching circuit combining the first output signal and the second output signal to generate an output signal. The first amplifying circuit includes a first transistor having a first electrode coupled to the first input terminal and a second electrode applied with a second bias voltage and a second transistor having a first electrode s coupled to the first input terminal and a second electrode applied with a third bias voltage. The first transistor generates the first output signal according to the first bias voltage and the second bias voltage. The second transistor generates the second output signal according to the first bias voltage and the third bias voltage.

Power amplifier supply networks with harmonic terminations are disclosed. In certain embodiments, a power amplifier system includes a first power amplifier that amplifies a first radio frequency (RF) signal of a first fundamental frequency, a second power amplifier that amplifies a second RF signal of a second fundamental frequency, and a power amplifier supply network that distributes a power amplifier supply voltage to the first power amplifier at a first distribution node and to the second power amplifier at a second distribution node. The power amplifier supply network includes a first harmonic termination circuit connected to the first distribution node that provide an open circuit at about twice the first fundamental frequency, and a second harmonic termination circuit connected to the second distribution node and that provides an open circuit at about twice the fundamental frequency.

Power amplifier supply networks with harmonic terminations are disclosed. In certain embodiments, a power amplifier system includes a first power amplifier that amplifies a first radio frequency (RF) signal of a first fundamental frequency, a second power amplifier that amplifies a second RF signal of a second fundamental frequency, and a power amplifier supply network that distributes a power amplifier supply voltage to the first power amplifier at a first distribution node and to the second power amplifier at a second distribution node. The power amplifier supply network includes a first harmonic termination circuit connected to the first distribution node that provide an open circuit at about twice the first fundamental frequency, and a second harmonic termination circuit connected to the second distribution node and that provides an open circuit at about twice the fundamental frequency.

A circuit module (e.g., an amplifier module) includes a module substrate, a thermal dissipation structure, a semiconductor die, encapsulant material, and an interposer. The module substrate has a mounting surface and a plurality of conductive pads at the mounting surface. The thermal dissipation structure extends through the module substrate, and a surface of the thermal dissipation structure is exposed at the mounting surface of the module substrate. The semiconductor die is coupled to the surface of the thermal dissipation structure. The encapsulant material covers the mounting surface of the module substrate and the semiconductor die, and a surface of the encapsulant material defines a contact surface of the circuit module. The interposer is embedded within the encapsulant material. The interposer includes a conductive terminal with a proximal end coupled to a conductive pad of the module substrate, and a distal end exposed at the contact surface of the circuit module.