Pre-distortion Doherty power amplifier based on variable capacitance diode loaded composite right/left hand transmission line

A technology of varactor diodes and composite left and right hands, which is applied in the direction of improving amplifiers to reduce nonlinear distortion and improving amplifiers to increase efficiency. It can solve problems such as linearity improvement, complex structure, and low efficiency of power amplifiers, so as to improve linearity and volume. Small, easy-to-integrate effects
CN112968675AInactive Publication Date: 2021-06-15CHONGQING UNIV OF POSTS & TELECOMM
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHONGQING UNIV OF POSTS & TELECOMM
Publication Date
2021-06-15
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a predistortion Doherty power amplifier based on a variable capacitance diode loading composite right / left hand transmission line, and belongs to the field of microwave circuits. The powe amplifier comprises a power divider, a predistortion module, a main power amplifier module, an auxiliary power amplifier module and a phase shift module; the input end of the power divider is a total input end, and the output end of the power divider is respectively connected with the input ends of the pre-distortion module and the main power amplifier module; the output end of the pre-distortion module is connected with the input end of the auxiliary power amplifier module; the output end of the main power amplifier module is connected with the phase shift module, and then the output end of the main power amplifier module and the output end of the auxiliary power amplifier module are combined into a total output end. According to the invention, the gain compression characteristic of the auxiliary power amplifier is well compensated, the phase distortion of the main power amplifier and the auxiliary power amplifier is corrected, the nonlinear distortion of the auxiliary power amplifier can be flexibly improved, and the linearity of the whole Doherty power amplifier is improved.
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Description

technical field

[0001] The invention belongs to the field of microwave circuits, and relates to a predistortion Doherty power amplifier based on a varactor diode loaded composite left and right hand transmission line. Background technique

[0002] With the development and continuous improvement of wireless communication, multi-carrier modulation with peak-to-average power ratio is widely used in communication systems, so the linearity of power amplifiers is becoming more and more important. In order to obtain higher linearity, power return is usually used. Back-off, feed-forward, negative feedback, and pre-distortion methods, the implementation of the first three will lead to lower efficiency or complex structure of the power amplifier. The Doherty power amplifier has a simple structure and can strike a balance between efficiency and linearity, but its linearity still needs to be improved.

[0003] At present, in order to improve the linearity of the Doherty power amplifier...

Claims

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