Abstract: A modular power amplifier system and an electronic device comprising the modular power amplifier system in which, the modular power amplifier system comprises a plurality of amplifier modules. The plurality of amplifier modules are arranged into a number of sections comprising a first section which comprises a first amplifier module configured to receive the input signal within a first amplitude range and provide an output signal having a first output power; a second section which comprises a second amplifier module configured to receive the input signal within a second amplitude range and provide an output signal having a second output power; and an i-th section which comprises multiple amplifier modules, each being configured to receive the input signal within a certain amplitude range and provide an output signal having a certain output power. The output signals of the amplifier modules are combined to provide output signals with scalable output power.

Abstract: A composite power amplifier for amplification of an input signal into an output signal is disclosed. The composite power amplifier comprises an input port for receiving the input signal, and an output port for providing the output signal. Furthermore, the composite power amplifier comprises a first set of sub-amplifiers, comprising at least two sub-amplifiers, wherein the at least two sub-amplifiers are arranged along a taper of a first transmission line, wherein the first transmission line is connected to the first set of sub-amplifiers and the output port. Moreover, the composite power amplifier comprises a second set of sub-amplifiers, comprising at least two sub-amplifiers, wherein the at least two sub-amplifiers are arranged along a taper of a second transmission line, wherein the second transmission line is connected to the second set of sub-amplifiers and the output port.

Abstract: An amplifier arrangement comprises N amplifier stages 101 to 10N, wherein N is an integer equal or greater than five. The amplifier arrangement comprises a cascade of quarter wavelength transmission line segments 111 to 11M coupled between an output of an amplifier of a first amplifier stage and an output node 15 of the amplifier arrangement. At least one intermediate junction 12 in the cascade of quarter wavelength transmission line segments comprises: a first amplifier coupled directly to the intermediate junction 12; and a second amplifier coupled to the same intermediate junction 12 via a connecting quarter wavelength trans mission line 131.

Abstract: A power amplifier comprising a first, a second and a third sub-amplifier for amplification of an input signal into an output signal. The sub-amplifiers are connected to an output network for providing the output signal at an output port of the output network. The output network comprises a first, a second and a third transmission line connected to the first sub-amplifier, the second sub-amplifier, and the third sub-amplifier, respectively. The first and second sub-amplifiers are operable in a first mode. The second and third sub-amplifiers are operable in a second mode. The first and third sub-amplifiers are operable in a third mode. Each of the first, second and third modes comprises a respective out-phasing mode in a respective part of an amplitude range of the power amplifier.

Abstract: An amplifier circuit (100) comprises three amplifier subcircuits (121,131,141) connected via a network of transmission lines to a common node. A control circuit is configured to control the three amplifier subcircuits (121,131,141) to operate in first, second, and third operating modes, such that a first subcircuit (121) is active in the first, second, and third modes, a second sub-circuit (141) is inactive in the first mode but active in the second and third modes, and a third subcircuit (131) is inactive in the first and second modes but active in the third. A quarter-wavelength transmission line (170) couples the output node of the second sub circuit (141) to the output node (160) of the third subcircuit (131).

Abstract: 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.

Abstract: An amplifier arrangement comprises N amplifier stages (101 to 10N), 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 (101) and an output node (15) of the amplifier arrangement, wherein the cascade comprises N?1 quarter wavelength transmission lines (111 to 11N?1). An amplifier of the Nth stage (10N) is coupled to the output node (15), and remaining amplifiers between the first and Nth stages (102 to 10N?1) coupled to successive junctions in the cascade of quarter wavelength transmission lines (111 to 11N?1).

Abstract: An amplifier arrangement comprises N amplifier stages comprising a main amplifier stage and a plurality of peaking amplifier stages. A transmission line comprises a varying impedance for transforming a load impedance to a higher impedance at the main amplifier stage, wherein the plurality of peaking amplifiers are coupled at intermediate locations to the transmission line. The amplifier arrangement is configured such that at least two of the peaking amplifiers are collectively driven with time delayed versions of substantially the same signal. The amplifier arrangement may be configured to operate with N?2 or fewer transition points in a Doherty mode of operation. As such, the amplifier arrangement may comprise more amplifier stages than are necessarily required in a Doherty amplifier arrangement having the same number of transition points.

Abstract: An amplifier arrangement comprises N amplifier stages (101 to 10N). The amplifier arrangement comprises a main cascade of quarter wavelength transmission lines coupled between an output of a main amplifier (102) of the N amplifier stages (101 to 10N) and an output node (15) of the amplifier arrangement, wherein the main cascade comprises N?1 quarter wavelength transmission lines (111 to 11N?1). An output of one peaking amplifier (10N) of the N amplifier stages is coupled to the output node (15), and remaining peaking amplifiers (101, 103 to 10N?1) of the N amplifier stages coupled to respective junctions (121 to 12N?2) in the main cascade of quarter wavelength transmission lines (111 to 11N?1).

Abstract: 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.

Abstract: An amplifier arrangement comprises N amplifier stages, wherein N is an integer equal or greater than five. The amplifier arrangement comprises a first cascade of quarter wavelength transmission line segments coupled to receive a first set of amplifier stages, and at least a second cascade of quarter wavelength transmission line segments coupled to receive a second set of amplifier stages. The first cascade and second cascade are connected to a common node, for example in parallel to an output node, or in parallel to an intermediate node.

Abstract: An amplifier circuit comprises a first amplifier configured to amplify a first input signal. The output of the first amplifier is coupled to an output node via a first transmission line, the first transmission line comprising a first portion having a first characteristic impedance and a first length, and a second portion having a second characteristic impedance and a second length. A second amplifier is configured to amplify a second input signal. The output of the second amplifier is coupled to the output node via a second transmission line, the second transmission line comprising a first portion having a first characteristic impedance and a first length, and a second portion having a second characteristic impedance and a second length. An auxiliary amplifier is configured to amplify a third input signal.

Abstract: An amplifier arrangement comprises N amplifier stages 101 to 10N, wherein N is an integer equal or greater than five. The amplifier arrangement comprises a cascade of quarter wavelength transmission line segments 111 to 11M coupled between an output of an amplifier of a first amplifier stage and an output node 15 of the amplifier arrangement. At least one intermediate junction 12 in the cascade of quarter wavelength transmission line segments comprises: a first amplifier coupled directly to the intermediate junction 12; and a second amplifier coupled to the same intermediate junction 12 via a connecting quarter wavelength trans mission line 131.

Abstract: A first amplifier is coupled to an output node via a first line having first and second portions. A second amplifier is coupled to the output node via a second line having first and second portions. An auxiliary amplifier is coupled via an auxiliary line network to a first intersection between the first and second portions of the first line, and to a second intersection between the first and second portions of the second line. For each of the first and second lines, the first and second portions have a higher-impedance portion and a lower-impedance portion whose combined length is a half wavelength. Lengths of the respective first portions of the first and second lines sum to half a wavelength, and the lengths of the respective second portions of the first and second lines sum to half a wavelength.

Abstract: An amplifier circuit (100) comprises three amplifier subcircuits (121,131,141) connected via a network of transmission lines to a common node. A control circuit is configured to control the three amplifier subcircuits (121,131,141) to operate in first, second, and third operating modes, such that a first subcircuit (121) is active in the first, second, and third modes, a second sub-circuit (141) is inactive in the first mode but active in the second and third modes, and a third subcircuit (131) is inactive in the first and second modes but active in the third. A quarter-wavelength transmission line (170) couples the output node of the second sub circuit (141) to the output node (160) of the third subcircuit (131).

Abstract: First and second amplifiers are respectively coupled to first and second lines, each having first and second portions. An auxiliary amplifier has an output coupled to an auxiliary line network which comprises: a first auxiliary line coupled between an auxiliary junction and a first intersection between the first and second portions of the first line; a second auxiliary line coupled between the auxiliary junction and a second intersection between the first and second portions of the second line; and a third auxiliary line for coupling the output of the auxiliary amplifier to the auxiliary junction. Each of the first and second lines have a higher-impedance portion and a lower-impedance portion whose lengths are substantially equal. Lengths of the respective first portions of the first and second lines sum to half a wavelength, and lengths of the respective second portions of the first and second lines sum to half a wavelength.

Abstract: An apparatus is provided for load modulating a power amplifier that is configured to output a multiband radio frequency signal comprising at least a first frequency band and a second frequency band. The apparatus comprises a multiplexer (31) coupled to receive a multiband radio frequency signal from the output of a power amplifier, and configured to separate the multiband radio frequency signal into first and second frequency band signals. A first load modulator circuit (33i) is provided in a first branch, the first load modulator circuit coupled to receive the first frequency band signal, and configured to load modulate the first frequency band signal. A second load modulator circuit (332) is provided in a second branch, the second load modulator circuit coupled to receive the second frequency band signal, and configured to load modulate the second frequency band signal.

Abstract: A power amplifier comprising a first, a second and a third sub-amplifier for amplification of an input signal into an output signal. The sub-amplifiers are connected to an output network for providing the output signal at an output port of the output network. The output network comprises a first, a second and a third transmission line connected to the first sub-amplifier, the second sub-amplifier, and the third sub-amplifier, respectively. The first and second sub-amplifiers are operable in a first mode. The second and third sub-amplifiers are operable in a second mode. The first and third sub-amplifiers are operable in a third mode. Each of the first, second and third modes comprises a respective out-phasing mode in a respective part of an amplitude range of the power amplifier.

Abstract: A power amplifier comprising a first, second and third sub-amplifier for amplification of an input signal into an output signal is disclosed. The sub-amplifiers are connected to an input network and an output network. The output network comprises a first, second and third transmission line connected to the first, second and third sub-amplifier, respectively. A difference in electrical length between the first, second and third transmission lines is an integer number of quarter-wavelengths of a center frequency of the power amplifier. A first, second and third electrical length includes the first, second and third transmission line, respectively. A longest one of the electrical lengths is at least a multiple of quarter-wavelengths of the center frequency. Furthermore, a radio network node, comprising the power amplifier, and a user equipment, comprising the power amplifier, are disclosed.

Abstract: A first amplifier is coupled to an output node via a first line having first and second portions. A second amplifier is coupled to the output node via a second line having first and second portions. An auxiliary amplifier is coupled via an auxiliary line network to a first intersection between the first and second portions of the first line, and to a second intersection between the first and second portions of the second line. For each of the first and second lines, the first and second portions have a higher-impedance portion and a lower-impedance portion whose combined length is a half wavelength. Lengths of the respective first portions of the first and second lines sum to half a wavelength, and the lengths of the respective second portions of the first and second lines sum to half a wavelength.