Power amplifier linearization method and apparatus

一种线性化、放大器的技术，应用在改进放大器以减少非线性失真、放大装置的零部件、放大器等方向，能够解决线性化改进程度局限性等问题

Inactive Publication Date: 2012-05-09
POSTECH ACAD IND FOUND
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0038] However, in the case of an amplifier, such as a Doherty amplifier, which includes distortion generating sources that generate mutually different nonlinear characteristics and memory effects, when linearization is performed at the amplification compensator 210 according to conventional linearization methods, the degree of linearization improvement has limitation

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  • Power amplifier linearization method and apparatus
  • Power amplifier linearization method and apparatus
  • Power amplifier linearization method and apparatus

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Embodiment Construction

[0058] Preferred embodiments of the invention shown in the accompanying drawings will now be described in more detail. Wherever possible, the same reference numerals will be used throughout the drawings and specification to refer to the same or like parts. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it would not obscure the subject matter of the present invention.

[0059] Before describing the invention in detail, it should be noted that a digital predistorter according to the invention can be used to compensate for mutually different nonlinear characteristics and memory effects generated by multiple sources of distortion generation during amplification by multiple amplifiers, wherein the The Doherty amplifier is described below as an example.

[0060] Figure 7a is a block diagram showing the internal configuration of the digital predistorter according to the fi...

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Abstract

Disclosed is a method and apparatus for linearizing a power amplifier using a digital signal process (DSP), and particularly, is a method and apparatus for effectively linearizing an amplifier which has a plurality of distortion generating sources. To this end, there is a plurality of compensation methods and compensation units which can generate inverse distortion signals corresponding to the distortion components outputted by the plurality of distortion generating sources, thereby making it possible to provide superior linearity.

Description

technical field [0001] The present invention relates to methods and apparatus for linearizing power amplifiers, and more particularly to methods and apparatus for efficiently linearizing power amplifiers having multiple sources of distortion generation. Background technique [0002] Recently, power amplifiers in mobile communication systems are required to amplify signals efficiently and with high linearity characteristics. Furthermore, next generation mobile communication systems utilize complex modulation schemes in order to transmit a large amount of data to users in a short time. [0003] Consequently, the peak-to-average power ratio (PAPR) of the signal increases. Typically, to provide linear amplification, the power amplifier operates at a back off point that is equal to or greater than the signal's peak-to-average power ratio. [0004] However, at this point, the power amplifier exhibits rather low efficiency characteristics. This is due to the fact that the heat v...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F1/32
CPCH03F2200/321H03F1/3241H03F2201/3209H03F1/0288
Inventor 金氾晚文程焕
Owner POSTECH ACAD IND FOUND
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