Abstract: An amplifier (300) comprising: a first signal path comprising first amplifier circuitry (105A) configured to receive a first signal (RF1) with a frequency and a variable phase and amplitude at the frequency; a second signal path comprising second amplifier circuitry (105B) configured to receive a second signal (RF2) with the frequency, wherein at least one of the relative phase and amplitude of the second signal is fixed at the frequency; combiner circuitry (106) configured to combine an output of the first amplifier circuitry and the second amplifier circuitry.

Abstract: In one aspect the embodiments relate to amplifier circuitry comprising an outphasing region and envelope tracking region. The outphasing region includes a signal processing block capable of receiving an amplitude and phase modulated input signal that is to be amplified, and processing said signal to separate it into two signals (S1, S2) of constant amplitude and modulated phase, a first signal S1 for driving a first RF power amplifier RF PA1 and a second signal S2 for driving a second RF power amplifier RF PA2. The output signals from each of the RF PAs are then provided to a power combiner (PC) for obtaining an output amplified signal (RF output).

Abstract: In one embodiment an amplifier circuit is disclosed. The amplifier circuit comprises an amplifying device configured to amplify a radiofrequency signal, the amplifying device having an output dynamic range; a supply modulator configured to modulate a supply voltage supplied to the amplifying device when an output of the amplifying device is within a first region of the output dynamic range; a tuneable matching network coupled to an output of the amplifying device; and a load controller configured to control the tuneable matching network, when the output of the amplifying device is within a second region of the output dynamic range, and thereby modulate the load to which the output of the amplifying device is applied.

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: In one embodiment a transmitter is disclosed.

Abstract: A power amplifier comprising an amplifying element for amplifying a signal input to the amplifier, a matching network for varying the reactance presented to the output of the amplifying element at the fundamental frequency of the input signal, the matching network being switchable between first and second operating configurations, wherein in the first operating configuration, a net inductive reactance is presented to the output at the fundamental frequency and in the second operating configuration, a net capacitive reactance is presented to the output at the fundamental frequency.

Abstract: In an embodiment an amplifier circuit comprises an amplifying element configured to amplify a radiofrequency input signal; a bias modulator configured to provide a bias voltage to the amplifying element, the bias voltage depending on a bias control signal; and a tuneable matching network configured to modulate the load to which the output of the amplifying element is applied.

Abstract: In one embodiment an amplifier circuit is disclosed. The amplifier circuit comprises an amplifying device configured to amplify a radiofrequency signal, the amplifying device having an output dynamic range; a supply modulator configured to modulate a supply voltage supplied to the amplifying device when an output of the amplifying device is within a first region of the output dynamic range; a tuneable matching network coupled to an output of the amplifying device; and a load controller configured to control the tuneable matching network, when the output of the amplifying device is within a second region of the output dynamic range, and thereby modulate the load to which the output of the amplifying device is applied.

Abstract: In one aspect the embodiments relate to amplifier circuitry comprising an outphasing region and envelope tracking region. The outphasing region includes a signal processing block capable of receiving an amplitude and phase modulated input signal that is to be amplified, and processing said signal to separate it into two signals (S1, S2) of constant amplitude and modulated phase, a first signal S1 for driving a first RF power amplifier RF PA1 and a second signal S2 for driving a second RF power amplifier RF PA2. The output signals from each of the RF PAs are then provided to a power combiner (PC) for obtaining an output amplified signal (RF output).

Abstract: A power amplifier comprising an amplifying element for amplifying a signal input to the amplifier, a matching network for varying the reactance presented to the output of the amplifying element at the fundamental frequency of the input signal, the matching network being switchable between first and second operating configurations, wherein in the first operating configuration, a net inductive reactance is presented to the output at the fundamental frequency and in the second operating configuration, a net capacitive reactance is presented to the output at the fundamental frequency.

Abstract: In one embodiment a transmitter is disclosed.

Abstract: In an embodiment an amplifier circuit comprises an amplifying element configured to amplify a radiofrequency input signal; a bias modulator configured to provide a bias voltage to the amplifying element, the bias voltage depending on a bias control signal; and a tuneable matching network configured to modulate the load to which the output of the amplifying element is applied.

Abstract: In an embodiment a wireless device comprises a plurality of power amplifiers operable to generate signals for transmission over different frequency channels of a wireless network; an antenna system coupled to the plurality of power amplifiers configured to transmit the signals generated by the power amplifiers; a battery configured to store energy and to supply electrical energy to the plurality of power amplifiers; an energy harvesting unit configured to harvest energy from the environment surrounding the wireless device and transfer the harvested energy to the battery; a management unit configured to determine spectrum status information of the wireless network, select one or more channels of the wireless network, and determine the output power of the power amplifiers; and a configuration unit configured to control the efficiency and output power of each of the power amplifiers.