A power amplifying apparatus includes a first bias circuit configured to generate a first bias current, a first amplification circuit, configured to receive the first bias current, amplify a signal input to the first amplification circuit through a first node, and output a first amplified signal to a second node, a second bias circuit, configured to generate a second bias current which has a magnitude different from a magnitude of the first bias current, and a second amplification circuit, connected in parallel with the first amplification, configured to receive the second bias current, amplify the signal input through the first node, and output a second amplified signal to the second node. The second amplification circuit is configured to output the second amplified signal with a third-harmonic component that has a phase offsetting a third-order intermodulation distortion (IM3) component included in the first amplified signal, based on the second bias current.

Beamforming channels of a satellite are calibrated using a low power, spread spectrum calibration signal. The power of the calibration signal is below the noise level of a user signal in an active channel, allowing channels to be calibrated while active. When calibrating the transmit side circuitry, a two-stage calibration can be used, first calibrating the output hybrid matrix, then calibrating the whole of the transmit side. To improve performance, the dwell time spend calibrating a channel can be based on the power of the user signal in the channel. A transmit probe can be used to inject a calibration signal into the receive antennae and a receive probe can be used to extract the calibration signal from the transmit antennae. To reduce frequency of calibrations, the calibrations can be based on path-to-path differences. These techniques are also applied to multiport amplifiers (MPAs).

A power amplification device capable of detaching an element relating to the power amplification of an RF signal from an element relating to the combining of RF signals. The amplifying unit is provided with a plurality of groups of amplifier circuits that amplifies the power of a RF signal and the plurality of groups of amplifier circuits each includes a predetermined number of the amplifier circuits. A combining unit includes a first combiner and a second combiner. The first combiner is provided in association with the group of the amplifier circuits, combines RF signals output from the amplifier circuits belonging to the corresponding group, and outputs the RF signal after combining. The second combiner combines the RF signals output from each first combiner and outputs the RF signal after combining. The amplifying unit is attachable to and detachable from the combining unit.

A power amplification device capable of detaching an element relating to the power amplification of an RF signal from an element relating to the combining of RF signals. The amplifying unit is provided with a plurality of groups of amplifier circuits that amplifies the power of a RF signal and the plurality of groups of amplifier circuits each includes a predetermined number of the amplifier circuits. A combining unit includes a first combiner and a second combiner. The first combiner is provided in association with the group of the amplifier circuits, combines RF signals output from the amplifier circuits belonging to the corresponding group, and outputs the RF signal after combining. The second combiner combines the RF signals output from each first combiner and outputs the RF signal after combining. The amplifying unit is attachable to and detachable from the combining unit.

The invention relates to a high frequency amplifier unit comprising several amplifier modules to amplify high frequency input signals into high frequency output signals and a coaxial combiner having an outer conductor and an inner conductor arranged coaxially to this to combine the high frequency output signals of the amplifier modules, wherein the amplifier modules are arranged on the outside of the outer conductor of the coaxial combiner and the amplifier modules are connected to the coaxial inner conductor of the coaxial combiner to transmit the high frequency output signals to the coaxial combiner. The invention additionally relates to an amplifier system.

A multiplier circuit can be fabricated within an integrated circuit and can draw a product output node to a voltage proportional to a product of first and second binary numbers received at two sets of inputs. The multiplier circuit includes a set of scaled capacitors, each capacitor of the set connected to an output of a multiplexor and to a local product output node. Each multiplexor is connected to the output of a multiplexor configured to generate an analog voltage in proportion to the value of the first binary number. Each scaled capacitor has a capacitance proportional to a significance of a respective bit of the second binary number. The multiplier circuit includes a reference capacitor connected to ground and the product output node, and a reset circuit configured to draw, in response to a RESET signal, the product output node to ground.

Provided is a dual-drive based Doherty amplifier that includes a first power amplifier and a second power amplifier that is in parallel with the first power amplifier. The first power amplifier is configured to receive a first portion of a signal having a first phase, and the second power amplifier is configured to receive a second portion of the signal having a second phase that has a phase difference from the first phase. At least one of the first power amplifier or the second power amplifier includes a dual-drive power amplifier core.

An N-way RF power amplifier device includes a power divider, multiple first power amplifier circuits, multiple second power amplifier circuits, and a power combiner. The power divider divides an RF input signal into multiple differential signal pairs each including complementary first and second division signals. The first power amplifier circuits amplify the first division signals and the second power amplifier circuits amplify the second division signals in such a way that the amplified first division signals and the amplified second division signals have the same phase. The power combiner combines the amplified first and second division signals into an RF output signal.

An embodiment of a module (e.g., an amplifier module) includes a substrate, a transmission line, and a ground plane height variation structure. The substrate is formed from a plurality of dielectric material layers, and has a mounting surface and a second surface opposite the mounting surface. A plurality of non-overlapping zones is defined at the mounting surface. The transmission line is coupled to the substrate and is located within a first zone of the plurality of non-overlapping zones. The ground plane height variation structure extends from the second surface into the substrate within the first zone. The ground plane height variation structure underlies the transmission line, a portion of the substrate is present between the upper boundary and the transmission line, and the ground plane height variation structure includes a conductive path between an upper boundary of the ground plane height variation structure and the second surface.

In a Doherty amplifier including a carrier amplifier (6) and a peaking amplifier (8) connected in parallel with each other, a compensation circuit (9) for causing an impedance seen from an output end (9a) of the compensation circuit (9) toward the peaking amplifier (8) to be open within a used frequency range and compensating for frequency dependence of an impedance seen from an output of a combiner (10) toward the combiner (10) in a state in which the peaking amplifier (8) is not operating is arranged between the peaking amplifier (8) and the combiner (10). This achieves a wider bandwidth without making the circuit larger in size and more complicated.