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Doherty amplifier

A technology for amplifiers and main amplifiers, applied in the direction of amplifiers, radio frequency amplifiers, amplifier combinations, etc., can solve the problems of low average efficiency of power amplifiers, degradation of output power of main devices, and the inability to fully utilize the rated power of PA devices

Active Publication Date: 2014-12-03
AMPLEON NETHERLANDS
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Problems solved by technology

[0008] The Doherty amplifier solves the problem that signals with significant amplitude modulation lead to the low average efficiency of conventional power amplifiers
Therefore, severe degradation of the output power of the main device results in the device delivering only 1 / 3 of its rated power
Therefore, this technique does not allow full utilization of the power rating of the PA device

Method used

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Embodiment Construction

[0063] The present invention provides a Doherty amplifier, preferably with symmetrical main and peaking amplifiers (ie same power), but different drain voltages applied to the power transistors of the main and peaking stages. The impedance converter (output network) comprises: at least one first series phase-shifting element between the output of the main amplifier and the output of the Doherty amplifier; and at least one second series phase-shifting element between the output of the peaking amplifier and the output of the Doherty amplifier between. This provides a broadband combiner. The combination of this broadband combiner and different drain drive levels provides an improved combination of efficiency and bandwidth.

[0064] As described in the above-cited document "A novel wideband and reconfigurable high average efficiency power amplifier", the bandwidth of the DPA at the back-off power level depends on the transformation ratio between the power combining point and the ...

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Abstract

A Doherty amplifier has different drain voltages applied to the power transistors of the main and peaking stages. The impedance inverter comprises at least one first series phase shifting element between the output of the main amplifier and the Doherty amplifier output and at least one second series phase shifting element between the output of the peaking amplifier and the Doherty amplifier output. This provides a wideband combiner. The combination of this wideband combiner and different drain drive levels provides an improved combination of efficiency and bandwidth.

Description

technical field [0001] The present invention relates to an electronic device comprising a Doherty amplifier ("DA") having an amplifier input and an amplifier output, wherein the amplifier has a main stage and at least one peaking stage. Background technique [0002] This type of amplifier has an input network connecting the amplifier input with the input of the main stage and the input of the peaking stage. An output network connects the output of the main stage and the output of the peaking stage to the output of the amplifier. [0003] A classic DA has two amplification stages, arranged in parallel and with equal power. The first of these two stages (the main stage) operates in Class AB amplifier mode, and the second (peaking stage) operates in Class C amplifier mode. [0004] These stages are separated at their input and output by a 90 degree phase shifting network. The output phase-shifting network has a specific characteristic impedance Zo, which must be equal to the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F1/07
CPCH03F3/68H03F3/195H03F3/193H03F2200/423H03F1/07H03F2200/451H03F3/245H03F2200/255
Inventor 杰瓦德·侯赛因·库雷希
Owner AMPLEON NETHERLANDS
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