A driver circuit for a composite power amplifier configured to operate in at least one Chireix-mode a first and a second sub-amplifier for amplification of an input signal into an output signal is disclosed. An input network of the driver circuit comprises a means configured to provide a first signal which is linearly derivable from the input signal, and a second signal which is non-linearly derivable from the input signal. The input network combines the first signal, at zero degrees phase shift, and the second signal, at 90 degrees phase shift, to obtain a first feeding signal for the first sub-amplifier. Furthermore, the input network combines the first signal, at 180 degrees phase shift, and the second signal, at 90 degrees phase shift, to obtain a second feeding signal for the second sub-amplifier.

An amplifier circuit is comprising a first amplifier configured to receive a first signal, a second amplifier configured to receive a second signal, a third amplifier configured to receive a third signal, and a directional coupler. An output of the first amplifier is connected to a first port of the directional coupler, an output of the third amplifier is connected to a second port of the directional coupler, an output of the second amplifier is connected to a third port of the directional coupler, and a fourth port of the directional coupler is connected to an output of the amplifier circuit. The directional coupler is configured such that different proportions of output signals of the second and third amplifiers are coupled to the first port of the directional coupler.

Disclosed is a reconfigurable power amplifier having a 2.sup.N?1 number of input-side reconfigurable quadrature couplers connected in a tree structure, wherein a 2.sup.(N?1) number of the input-side reconfigurable quadrature couplers have coupler output terminals, and a root of the tree structure is one of the input-side reconfigurable quadrature couplers having a main input terminal. Also included is a 2.sup.N?1 number of output-side reconfigurable quadrature couplers connected in a tree structure, wherein a 2.sup.(N?1) number of the output-side reconfigurable quadrature couplers have coupler input terminals, and a root of the tree structure is one of the output-side reconfigurable quadrature couplers having a main output terminal. Further included is a 2.sup.N number of constituent amplifiers divided into amplifier pairs having amplifier input terminals connected to corresponding ones of the coupler output terminals and having amplifier output terminals coupled to corresponding ones of the coupler input terminals.

The present invention provides an amplifier arrangement for amplifying a broadband signal, the amplifier arrangement comprising a signal splitter configured to receive the broadband signal and output a first split signal and a second split signal, and a balanced amplifier that is coupled to the signal splitter and is configured to amplify the first split signal and the second split signal and is configured to output a single amplified broadband signal based on the amplified first split signal and the amplified second split signal. The present invention further provides a respective method.

A power amplifying converter comprises a multi-balanced-unbalanced converting unit, a plurality of power amplifying units, a plurality of dual-path power combining units and a differential power combining unit. The multi-balanced-unbalanced converting unit is provided with a first input/output end and a plurality of second input/output ends. Each of the power amplifying units is provided with a first input end electrically connected to the second input/output end, and a first output end. Each of the dual-path power combining units is provided with two second input ends electrically connected to the first output ends, and a second output end. The differential power combining unit is provided with two third input ends electrically connected to the second output ends, and a third output end. In this case, the multi-balanced-unbalanced converting unit is made up of a plurality of 1/12 wavelength transmission lines.

Circuit for wireless communication are provided, the circuits comprising: a first quadrature hybrid having a first in port, a first iso port, a first cpl port, and a first thru port; a first mixer having a first input coupled to the first cpl port and having an output; a second mixer have a first input coupled to the first cpl port and having an output; a third mixer having a first input coupled to the first thru port and having an output; a fourth mixer having a first input coupled to the first thru port and having an output; and a first complex combiner having inputs coupled to the output of the first mixer, the output of the second mixer, the output of the third mixer, and the output of the fourth mixer that provides first I and Q outputs based the output of the first mixer and the output of the second mixer.

Amplifier error correction circuits are disclosed, including in an example an amplifier error correction circuit. The amplifier error correction circuit comprises a plurality of sub-amplifiers, a first input adapted to receive an output signal of an amplifier circuit, and an error signal input adapted to receive an error signal indicative of an error in the output signal of the amplifier circuit. The amplifier error correction circuit also comprises a sub-amplifier input signal preparation circuit adapted to provide a respective portion of the error signal to each of the sub-amplifiers, and an output signal combining circuit adapted to combine outputs of the sub-amplifiers with the output signal of the amplifier circuit and to provide a combined signal to an output of the amplifier correction circuit. At least one of the sub-amplifiers comprises a cascode amplifier.

According to an example aspect of the present invention, there is provided an isolating amplifier apparatus comprising a first 2?2 hybrid coupler and a second 2?2 hybrid coupler, each 2?2 hybrid coupler having a first input port, a second input port, a first output port and a second output port, a first travelling wave parametric amplifier, TWPA, comprising an input connected to the first output port of the first 2?2 hybrid coupler and an output connected to the first input port of the second 2?2 hybrid coupler, and a second travelling wave parametric amplifier, TWPA, comprising an input connected to the second output port of the first 2?2 hybrid coupler and an output connected to the second input of the second 2?2 hybrid coupler.

An amplifier package includes a plurality of input leads, a plurality of transistor amplifiers having inputs respectively coupled to one of the plurality of input leads, and a quadrature hybrid coupler within the amplifier package and coupled between the plurality of input leads and the plurality of transistor amplifiers, wherein the quadrature hybrid coupler is configured to divide an input signal received from a first of the plurality of input leads between the plurality of transistor amplifiers.

An RF amplifier utilizes first and second main amplifiers in a balanced amplifier configuration with first and second auxiliary amplifiers connected in parallel across the first and second main amplifiers, respectively. The main and the auxiliary amplifiers are biased such that the third-order nonlinearity components in the combined output current are reduced. A common or independent bias control circuit(s) control(s) the DC operating bias of the auxiliary amplifiers and establishes DC operating points on curves representing third-order nonlinear components within the drain current having a positive slope (opposite to the corresponding slope of the main amplifiers). This results in reduction of overall third-order nonlinear components in combined currents at the output. In another embodiment, a phase shift of an input to one auxiliary amplifier is used to provide a peak in minimization at a frequency associated with the phase shift.