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Doherty PA (power amplifier) with Cartesian feedback loop

A technology of power amplifiers and feedback loops, applied in the direction of improving amplifiers to increase efficiency, improving amplifiers to reduce nonlinear distortion, etc.

Inactive Publication Date: 2014-04-02
许文
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When the input signal is a 3G / 4G signal with a relatively high peak-to-average ratio, the Doherty PA Doherty power amplifier can greatly improve the system efficiency, and the EVM, ACPR and other problems caused by the nonlinear distortion of the Doherty PA are eliminated by Cartesian Loop Cartesian feedback loop is corrected, thus surpassing the existing system in terms of system linearity and power efficiency

Method used

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  • Doherty PA (power amplifier) with Cartesian feedback loop
  • Doherty PA (power amplifier) with Cartesian feedback loop
  • Doherty PA (power amplifier) with Cartesian feedback loop

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Embodiment Construction

[0014] In order to solve the above-mentioned technical problems, the present invention mainly relates to the design method that adopts Doherty PA Doherty power amplifier and Cartesian Loop Cartesian feedback loop combination, has combined Doherty power amplifier and Cartesian Loop Cartesian feedback loop respective advantages. When the input signal is a 3G / 4G signal with a relatively high peak-to-average ratio, the Doherty PA Doherty power amplifier can greatly improve the system efficiency, and the EVM, ACPR and other problems caused by the nonlinear distortion of the Doherty PA are eliminated by Cartesian Loop is corrected by the Cartesian feedback loop, thus surpassing the existing system in terms of system linearity and power efficiency.

[0015] image 3 shows the transmitter architecture of the present invention, and figure 2 The difference is that PA (118) is replaced by Doherty PA in box 230. In this way, when the input signal is a 3G / 4G signal with a high peak-to-...

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Abstract

The invention relates to the technical field of mobile communication 3G / 4G power amplifiers. A design method that a Doherty PA (power amplifier) and a Cartesian feedback loop are combined is adopted, and respective advantages of the Doherty PA and the Cartesian feedback loop are combined. When an input signal is a 3G / 4G signal of which the peak average is higher, the system efficiency can be greatly improved by the Doherty PA, and the problems of EVM, ACPR and the like brought by the non-linear distortion of the Doherty PA are corrected by the Cartesian feedback loop, and therefore the communication system provided by the invention exceeds a traditional system in two aspects of linearity and power efficiency.

Description

technical field [0001] The invention relates to the technical field of mobile communication 3G / 4G base station power amplifiers, and specifically refers to a design method that combines Doherty PA Doherty power amplifiers and Cartesian Loop Cartesian feedback loops, and combines Doherty PA power amplifiers and Cartesian Loop Cartesian feedback loops have their own merits, thereby surpassing existing systems in terms of both system linearity and power efficiency. Background technique [0002] The power amplifier is one of the core components of the mobile communication system. In order to pursue higher data rate and spectral efficiency, 3G / 4G communication systems generally adopt linear modulation, requiring the transmitter power amplifier to work in a linear state, so that linearization technology and efficiency enhancement technology become the key to power amplifier (PA) design . [0003] Linearization principle: Because of the nonlinear characteristics of the transistor...

Claims

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Application Information

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IPC IPC(8): H03F1/07H03F1/32
Inventor 许文吕全立
Owner 许文
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