A multichannel splitter formed from 1 to 2 splitters. An input terminal of a first 1 to 2 splitter defines an input of the multichannel splitter. The 1 to 2 splitters are electrically series-connected. First respective outputs of the 1 to 2 splitters define output terminals of the multichannel splitter.

An amplifier arrangement comprises N amplifier stages, wherein N is an integer equal or greater than four. The amplifier arrangement comprises a cascade of quarter wavelength transmission lines coupled between an output of an amplifier of a first amplifier stage and an output node of the amplifier arrangement, wherein the cascade comprises N−1 quarter wavelength transmission lines. An amplifier of the Nth stage is coupled to the output node, and remaining amplifiers between the first and Nth stages coupled to successive junctions in the cascade of quarter wavelength transmission lines. The amplifier arrangement is further configured such that the amplifier of the Nth stage is coupled to the output node via a connecting quarter wavelength transmission line, and whereby each of the remaining amplifiers of the N−2 stages closest to the output node is coupled by a respective connecting quarter wavelength transmission line to a respective junction of the cascade of quarter wavelength transmission lines.

Systems are provided for RF high power generation. An arrangement includes an RF power combiner, at least one RF power amplifier, a switch, a control unit, and a transmission line. The RF power combiner has at least one RF input and at least one RF output. The RF power amplifier is electrically connected to the RF input via the transmission line. The switch is included in the transmission line. The switch is configured to control, by a switching action, transmission of a RF signal from the RF power amplifier to the RF input via the transmission line. The control unit is electrically connected to the switch. The control unit is configured to control the switching action of the switch. The control unit is electrically connected to the switch via the same transmission line.

A radio frequency (RF) power amplifier includes an amplifying stage that includes an amplifying module, an input module and a feedback module. The amplifying module receives an RF to-be-amplified signal, and performs power amplification on the RF to-be-amplified signal to generate an RF output signal. The input module receives an RF input signal. The feedback module receives the RF output signal, cooperates with the input module to provide the RF to-be-amplified signal based on the RF input and output signals, and cooperates with the amplifying module to forma positive feedback loop that provides a loop gain which is less than one.

A power amplifier includes an outphasing amplifier. The outphasing amplifier includes a first amplifier and a second amplifier, and is configured to provide a first amplified RF signal and a second amplified RF signal that is phase shifted from the first amplified RF signal. The power amplifier further includes an output circuit that is configured to combine RF power of the first and second amplified RF signals at a summing node. The output circuit includes a first branch connected between the first amplifier and a summing node and a second branch connected between the second amplifier and the summing node. The first and second branches are each configured to match an output impedance of the first and second amplifiers and to phase shift the first and second amplified RF signals for an outphasing operation using common reactive components for the match of the output impedance and the outphasing operation.

A transmission apparatus is provided with: a plurality of amplification units that amplify RF signals arranged in at least 2 bands; a first control unit that selects amplification units that perform an amplification operation, from among the plurality of amplification units, in accordance with total power of RF signals to be transmitted; a second control unit which, in accordance with a power ratio of the RF signals to be transmitted in respective bands, changes the power ratio of the RF signals in the respective bands while keeping constant the total power of the RF signals received at each of the selected amplification units; and a combining unit that combines the RF signals outputted by the selected amplification units.

Distributed amplifier systems and methods are disclosed. An example distributed amplifier system includes first stage traveling wave amplifier (TWA) circuitry that is controllable to provide one of a first set of discrete gain settings. The first stage TWA circuitry includes a first input transmission line, a first output transmission line, and a first plurality of amplifiers coupled antiparallel between the first input transmission line and the first output transmission line. The first set of discrete gain settings has approximately constant logarithmic spacing.

An amplifier, communication device and method of amplification are disclosed. An RF signal is amplified by a Doherty power amplifier (DPA). The DPA has a main amplifier with a Class-AB amplifier in parallel with a Class-C amplifier. When the RF signal power is smaller than 6 dB PBO, the Class-AB amplifier provides the main amplifier amplification; when the RF signal is between 6 dB PBO and 0 dB PBO, both the Class-AB and Class-C amplifiers provide the main amplifier amplification.

Described herein is a single-input hybrid Doherty power amplifier (PA). Unlike the conventional 214 Doherty PA inverter which only performs the correct load modulation at its center frequency, the hybrid Doherty PA (HDω-PA) combiner network achieves a wideband load modulation using the frequency dependence of the electrical length of the output combiner lines versus frequency for sliding the PA mode of operation. A modified theory is presented herein to allow for a single-input PA implementation. In this design, the outphasing angle is only changing with frequency and not the input power. A transmission line phase shifter is used to provide the correct frequency-dependent input phase offset ensuring the correct wideband load modulation performed by the output combiner

A solidstate amplifier includes at least one interconnection, between a microstrip and a linearized impedance matching waveguide ridge, the interconnection being provided with a clamping device.