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A wideband amplifier

A technology of amplifiers and Doherty amplifiers, applied in amplifiers, radio frequency amplifiers, amplifier types, etc., can solve the problems of large physical size and high cost

Active Publication Date: 2015-03-18
AMPLEON NETHERLANDS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The physical size of conventional broadband Doherty amplifiers is relatively large, which leads to relatively high costs associated with the mechanical design of the transmitter

Method used

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  • A wideband amplifier
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Examples

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Embodiment Construction

[0079] figure 2 A Doherty amplifier according to an embodiment is shown. The Doherty amplifier receives an input signal "IN" in splitter 10 . A splitter produces two signals from an input signal. The splitter can be a simple electrical node; in other embodiments it can be, but is not limited to, a balun or transformer. Those skilled in the art will appreciate that a balun converts an unbalanced signal into two balanced signals (or vice versa), and in this context, the input signal can be an unbalanced signal, and the two split signals are balanced Signal. In general, the task of a splitter is to split an input signal into two signals, which can have similar or usually nearly equal amplitudes. These two signals are fed into respective further splitters 12 and 13 . The further splitters may generally be baluns, that is to say a second balun 12 and a third balun 13 . In an embodiment a phase compensation circuit 11 may be provided, which may be located between the splitter...

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PUM

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Abstract

A Doherty amplifier is disclosed, being adapted to receive an RF input signal and to output an RF output signal and comprising a main amplifier and a peak amplifier, each comprising: a first amplifier (T1, T1') and a second amplifier (T2, T2'), each amplifier having a respective input terminal and a respective output terminal, the first amplifier and the second amplifier being adapted to amplify a respective input signal derived from the RF input signal and received at the respective input terminal and to deliver a first output signal and a second output signal, respectively; a first phase shifter (14, 14') and a second phase shifter (15, 15') coupled to the output terminal of the first amplifier and to the output terminal of the second amplifier, respectively; a third phase shifter (16, 16'); and a fourth phase shifter (17, 17').

Description

technical field [0001] This invention relates to broadband amplifiers and methods of making such amplifiers. Background technique [0002] Doherty amplifiers are used on a large scale in modern base stations for mobile communications. Various Doherty amplifiers are available for broadband operation in broadcast applications. figure 1 The structure of such a broadband Doherty amplifier is shown. The amplifier comprises a signal splitter 1 adapted to split the input signal into two approximately equal amplitude components. The first component is input into a phase shifter 2 and the resulting phase-shifted signal is further input into a main amplifier 3 . The second component is input into the peaking amplifier 7 . Typically, the phase shift is 90 degrees. In normal operation, the main amplifier 3 operates in class AB and the peak amplifier in class C. The two components of the input signal are amplified by the two amplifiers and a respective amplified signal is obtained ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F1/07
CPCH03F2200/09H03F3/211H03F2200/423H03F1/56H01P5/187H03F2200/192H03F2200/198H03F2203/45481H03F3/193H03F1/0288H03F2200/451H01P1/184H03F2203/21142H03F2203/21139H03F3/604H03F2200/204H03F3/45183H03F2203/21106
Inventor 杰瓦德·侯赛因·库雷希
Owner AMPLEON NETHERLANDS
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