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.
CN103701413AInactive Publication Date: 2014-04-02许文
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
许文
Publication Date
2014-04-02
Estimated Expiration
Not applicable · inactive patent

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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.
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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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