A feedforward amplifier comprises a power amplifier that generates an amplified signal, an error correcting circuitry that generates a first error signal and a second error signal based on an error in the amplified signal; and an output circuitry. The output circuitry comprises: a first quadrature coupler, an output of a first error amplifier is connected to the quadrature coupler and an input of the first error amplifier is configured to receive the first error signal, and an output of a second error amplifier is connected to the quadrature coupler and an input of the second error amplifier is configured to receive the second error signal. The output circuitry generates an error compensation signal in the first quadrature coupler from the output signals of the first and second error amplifiers.

Systems and apparatuses are disclosed that include a modular power amplifier having a power amplifier subsystem with a first 90 degree hybrid block configured to receive an RF signal and output a split RF signal with components having a 90 degree phase shift, a second 90 degree hybrid block configured to receive and combine the split RF signal by removing the 90 degree phase shift, a high-power amplifier configured to amplify at least one of the components of the split RF signal. The modular power amplifier also includes a power distribution module configured to regulate an amount of power input to the high-power amplifier and a power sequencer configured to control the timing of power delivery by the power distribution module. Three-dimensional power amplifiers having a first high-power amplifier and a second high-power amplifier having different orientations causing a reduction in electromagnetic interference are also disclosed.

The present disclosure generally relates to a high frequency amplifier, a system and a method for setting an operating state of a high frequency amplifier. The high frequency amplifier includes at least a first amplification circuit with a first frequency range, at least one second amplification circuit with a second frequency range, a hybrid coupler circuit with an isolated port, and a termination with at least one switch device. The hybrid coupler circuit is connected to output sides of the first amplification circuit and the second amplification circuit. The termination is connected with the isolated port. The high frequency amplifier has an operating range based on the first amplification circuit and the second amplification circuit. The high frequency amplifier has a load modulation in dependence of the first amplification circuit and the second amplification circuit. A first contact of the at least one switch device is directly coupled to ground.

An electronic device is provided. The electronic device may include a plurality of antennas configured to transmit and receive a signal in a radio frequency (RF) frequency band; and an RF circuit configured to process the signal in the RF frequency band. The RF circuit includes a reception (Rx) path configured to transfer a first signal received through the plurality of antennas, a transmission (Tx) path configured to transfer a second signal to the plurality of antennas, and a coupler configured to transfer at least a part of the second signal obtained in the Tx path to the Rx path. The Tx path includes a power divider configured to distribute power to at least one antenna among the plurality of antennas, and the coupler is electrically connected to an input terminal of the power divider to be disposed before the power divider.

An impedance converter includes an insulating layer; a first wire provided on a first surface of the insulating layer and extending in a first direction; a second wire provided on a second surface of the insulating layer and extending in the first direction and face the first wire, the second surface being located on a side opposite to the first surface; a third wire provided on the first surface and extending in a second direction orthogonal to the first direction; a fourth wire provided on the second surface and extending in the second direction and face the third wire; a fifth wire provided on the first surface and extending in the second direction; and a sixth wire provided on the second surface and extending in the second direction and face the fifth wire.

A power amplifier is described that includes a balanced amplifier arrangement having an input quadrant coupler and output quadrant coupler and two amplifiers, which may include or consist of single transistors, there between. The power amplifier also can provide a signal to an isolated port of the output coupler in order to provide impedance matching. This arrangement dispenses with the need for transistor matching networks at the output of the two amplifiers, which in turn enables the power amplifier to be operable over a wider frequency range as compared with a Doherty power amplifier.

A multistage linear power amplifier receiving an input signal. The multistage linear power amplifier comprises a plurality of Class-AB amplifiers connected in a cascade configuration. The plurality of Class-AB amplifiers amplifies the input signal to generate an amplified input signal. At least one of the plurality of Class-AB amplifiers is biased such that the multistage linear power amplifier emulates a Class-C amplifier.

A multichannel transmission system which includes a calibration functionality that allows precise calibration of the frequency conversion chains and of the multiport amplifier of the system to be performed without interruption of service. The proposed calibration makes it possible to correct the defects over the entire frequency band of the system.

Examples of an amplifier includes an input divider section having a first path and a second path for branching of an input signal, wherein a passing phase at the first path and a passing phase at the second path are different; a first amplifying element that amplifies a signal input to the first path; a second amplifying element that amplifies a signal input to the second path; an output synthesizing section that performs synthesis of an output of the first amplifying element and an output of the second amplifying element with a third path for transmitting the output of the first amplifying element and a fourth path for transmitting the output of the second amplifying element, wherein a passing phase at the third path and a passing phase at the fourth path are different; and an electromagnetic coupling section that establishes electromagnetic coupling of two signals.

An envelope tracking (ET) power amplifier apparatus is provided. The ET power amplifier apparatus includes a pair of power amplifiers configured to amplify a pair of radio frequency (RF) signals based on a pair of ET voltages. In one aspect, each of the RF signals is split before amplification and recombined after amplification. As such, the power amplifiers can operate based on half the peak power of the RF signals to help improve operating efficiency of the power amplifiers. In another aspect, the RF signals are pre-processed prior to amplification to form a pair of composite RF signals with similar average power such that the power amplifiers can operate based on substantially similar ET voltages. As a result, it may be possible to employ a single ET integrated circuit (ETIC) to provide the ET voltages, thus helping to reduce cost and footprint of the ET power amplifier apparatus.