Abstract: A phase-reconfigurable circuit for a dual-input power amplifier is provided. The circuit includes an envelope detector configured to process an envelope of an RF input signal into an envelope signal. A first vector-sum phase-shifter and a second vector-sum phase-shifter processes an in-phase and a quadrature-phase version of the RF input signal with the envelope signal to produce a first differential output signal having a dynamically-modulated phase difference with a second differential output signal.

Abstract: This disclosure provides systems, methods, and devices for wireless communications that support multiple antenna operation. In a first aspect, an apparatus for wireless communications includes an amplifier module comprising a first input node, a second input node, a first output node, a second output node, and a third output node, with the amplifier comprising a first processing path configured to couple the first input node to the first output node; and a second processing path configured to couple the second input node to the second output node in a first mode and to couple the second input node to the third output node in a second mode. Other aspects and features are also claimed and described.

Abstract: Certain aspects of the present disclosure generally relate to electronic components and, more particularly, to circuitry for signal amplification for transmission. One example apparatus generally includes: a modem; a controller; a feedforward path coupled between the modem and the bias controller; and an amplifier having a main amplification path and an auxiliary amplification path, wherein the controller is configured to provide at least one bias signal for biasing the auxiliary amplification path based on information associated with a transmission signal, the information being provided by the modem to the controller via the feedforward path.

Abstract: A phase-reconfigurable circuit with programmable power splitting for a dual-input power amplifier is provided. The circuit includes an I/Q generator to generate I and Q RF signals from an input RF signal. A first vector-sum phase-shifter processes the I and Q RF signals to produce a first RF output signal. Similarly, a second vector-sum phase-shifter processes the I and Q RF signals to produce a second RF output signal.

Abstract: A Doherty amplifier is provided with a lumped-element combiner that includes a first capacitor and an inductor. Should the inductor be coupled between an output terminal of the main amplifier and an output node of the Doherty amplifier, the first capacitor couples between an output terminal of the auxiliary amplifier and the output node. Conversely, if the first capacitor is coupled between the output terminal of the main amplifier and the output node, then the inductor couples between the output terminal of the auxiliary amplifier and the output node. A current scaling ratio of the Doherty amplifier ranges from 0.4 to 0.6 to enhance the bandwidth.

Abstract: An embodiment provides an amplifier system with multiple amplification paths connected to a combiner for combination of signals amplified in the amplification paths, each amplification path comprising an amplifier and a matching network provided between the amplifier and the combiner, wherein the individual amplifiers can interact through the combiner, causing an active load-pull effect. The matching networks of the paths comprise harmonic terminations configured to one or more of reduce an overlap between the voltage and current waveforms within the amplifier connected to the matching network and improve the linearity of one or more of the amplifiers.

Abstract: An embodiment provides an amplifier system with multiple amplification paths connected to a combiner for combination of signals amplified in the amplification paths, each amplification path comprising an amplifier and a matching network provided between the amplifier and the combiner, wherein the individual amplifiers can interact through the combiner, causing an active load-pull effect. The matching networks of the paths comprise harmonic terminations configured to one or more of reduce an overlap between the voltage and current waveforms within the amplifier connected to the matching network and improve the linearity of one or more of the amplifiers.