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.

An amplifier arrangement (200) for amplifying input signals and a method for operating the amplifier arrangement are disclosed. The amplifier arrangement (200) comprises a main amplifier circuit (210) having an input and an output; a first (221) and second (222) auxiliary amplifier circuits each having an input and an output, wherein each of the first (221) and second (222) auxiliary amplifier circuits being selectively operable to operate in combination with the main amplifier circuit (210). The amplifier arrangement (200) further comprises a single hybrid coupler circuit (230) having a first port (221) being coupled to the output of the main amplifier circuit (210), a second port (232) being coupled to the output of the first auxiliary amplifier circuit (221), a third port (233) being coupled to the output of the second auxiliary amplifier circuit (222) and a fourth port (234) being coupled to the load (240) of the amplifier (200).

An electronic device is disclosed. The electronic device may include an antenna for transmitting and receiving a signal in an RF frequency band, and an RF circuit for processing the signal in the RF frequency band. The RF circuit may include an Rx path for transferring a first signal received through the antenna, a Tx path for transferring a second signal output from an amplifier to the antenna, and a coupler for transferring at least a part of the second signal obtained in the Tx path to the Rx path. In addition, various embodiments understood from the specification are possible.

The present invention relates to a four-way Doherty amplifier. The invention further relates to a mobile telecommunications base station. The invention proposes a new Doherty combiner topology that allows peak efficiencies to be reached at deeper back-off levels than conventional Doherty combiners.

According to various embodiments, a quadrature hybrid coupler included as part of a phase shifter is used to provide variable phase shift to an input signal. The quadrature hybrid coupler includes an input port, an output port, and two terminated ports. The phase shifter includes one or more static lumped elements connected to the QHC to reduce at least one electrical dimension of the QHC to substantially less than a quarter wavelength. The phase shifter also include one or more variable lumped elements connected to the QHC to provide a variable phase shift to the input signal between the input port and the output port of the QHC.

A directional coupler includes a main line through which a first signal in a first frequency band and a second signal in a second frequency band pass from a first port to a second port, a sub-line electromagnetically coupled to the main line and having a third port and a fourth port, the third port outputting a first coupled signal corresponding to the first signal and a second coupled signal corresponding to the second signal, a first termination circuit connected to the fourth port and used in outputting the first coupled signal, a second termination circuit connected to the fourth port and used in outputting the second coupled signal, and a first filter circuit disposed between the fourth port and the first termination circuit, wherein the first filter circuit has frequency characteristics allowing the first coupled signal to pass therethrough and attenuating the second coupled signal.

A sequenced transmit muting wideband power amplifier is provided that includes at least one pre-driver stage having at least a first pre-driver and a second pre-driver. A mute switch selectively establishes a communication path between the first and second pre-drivers or couples the second pre-driver to a termination resistor. A pre-driver switch selectively activates/deactivates the first and second pre-drivers. A driver stage is in communication with the pre-driver stage and includes a first driver. A final amplifier stage is in communication with the driver stage and includes at least one second driver. At least one S-NBS switch is configured to selectively activate/deactivate the first driver and second driver. A controller is configured to activate the at least one pre-driver switch, the mute switch, the at least one S-NBS switch to selectively place the amplifier in one of a transmit mode and a mute mode.

A Doherty amplifier has a first amplifier path that includes a first amplifier, a second amplifier path that includes a second amplifier, a power divider, and a short-circuited stub. The power divider receives an RF signal and divides the RF signal into first and second input signals. The power divider includes first and second power divider outputs that produce the first and second input signals, respectively. The short-circuited stub is coupled between the first power divider output and the first amplifier or between the second power divider output and the second amplifier. The first and second amplifier paths are characterized by first and second frequency-dependent insertion phases, respectively. A slope of the first or second frequency-dependent insertion phase is altered by the short-circuited stub. The power divider produces the first and second input signals with a quadrature phase shift.

An amplification device includes a plurality of amplifiers arranged in parallel, a plurality of directional couplers coupled to the plurality of amplifiers, respectively, and configured to receive output signals of the plurality of amplifiers, respectively, a phase shifter coupled to a first directional coupler of the plurality of directional couplers, and configured to generate a first signal to which a phase of an output signal of the first directional coupler is inverted, a combining circuit coupled to the phase shifter and a second directional coupler of the plurality of directional couplers, and configured to combine an output signal of the phase shifter and an output signal of the second directional coupler, and a processor configured to control at least one of the plurality of amplifiers so that a level of an output signal of the combining circuit is minimized.

An amplification device includes a plurality of amplifiers arranged in parallel, a plurality of directional couplers coupled to the plurality of amplifiers, respectively, and configured to receive output signals of the plurality of amplifiers, respectively, a phase shifter coupled to a first directional coupler of the plurality of directional couplers, and configured to generate a first signal to which a phase of an output signal of the first directional coupler is inverted, a combining circuit coupled to the phase shifter and a second directional coupler of the plurality of directional couplers, and configured to combine an output signal of the phase shifter and an output signal of the second directional coupler, and a processor configured to control at least one of the plurality of amplifiers so that a level of an output signal of the combining circuit is minimized.