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Method for widening bandwidth of Doherty power amplifier and Doherty power amplifier improved with method

A power amplifier and power divider technology, which is applied in the direction of improving the amplifier to expand the bandwidth, improving the amplifier to improve efficiency, etc., can solve the problems of limiting the broadband characteristics of Doherty power amplifiers, and achieve the effects of cost reduction, energy saving, and overall performance improvement

Inactive Publication Date: 2013-12-18
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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AI Technical Summary

Problems solved by technology

[0004] Because the Doherty power amplifier uses two impedance transformers to realize load modulation, and the two impedance transformers are all composed of quarter-wavelength microstrip lines, so that Limits the broadband characteristics of Doherty power amplifiers

Method used

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  • Method for widening bandwidth of Doherty power amplifier and Doherty power amplifier improved with method
  • Method for widening bandwidth of Doherty power amplifier and Doherty power amplifier improved with method
  • Method for widening bandwidth of Doherty power amplifier and Doherty power amplifier improved with method

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Experimental program
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Effect test

Embodiment

[0046] Impedance transformation ratio (1)

[0047] The frequency response of the impedance transformer 600 is as image 3 As shown, when r is smaller, it has wider bandwidth characteristics.

[0048] The impedance transformation ratio of the impedance converter 600 of the parallel Doherty power amplifier is r=2, that is, the 50 convert to 100 , to achieve load modulation.

[0049] impedance transformer 600, such as Figure 4 shown. According to the principle of simple real-frequency technology, it can be simplified as an ideal lossless two-port network with frequency-dependent characteristics. suppose for

[0050] (2)

[0051] In formula (2), n is the order of the matching network, and s is the complex frequency.

[0052] Using Bellevue's late substitution method, other scattering parameters:

[0053] (3)

[0054] (4)

[0055] Among them, k is an integer, which defines the transmission zero order.

[0056] Because of the lossless nature of t...

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Abstract

The invention provides a method for widening the bandwidth of a Doherty power amplifier and the Doherty power amplifier improved with the method. The Doherty power amplifier comprises a bandwidth power distributor module, a bandwidth input matching network module, a main power amplifier, a peak value power amplifier, a bandwidth output matching network module, a compensation line module and an impedance converter module, wherein the compensation line module comprises a compensation line of a main power amplifier branch and a compensation line of the peak value power amplifier branch, the compensation line of the main power amplifier branch converts load impedance into an optimal load impedance point in a lower power state; the compensation line of the peak value power amplifier branch enables the output impendence of the peak value power amplifier to present infinity and prevents the power of the main amplifier from being leaked to the peak value power amplification branch in a low power state. According to the invention, the bandwidth of the Doherty power amplifier can be widened and the returning efficiency of the Doherty power amplifier can be improved, load conditioning can be better achieved, the Doherty power amplifier can be applied to a multi-module base station and software radio, and energy conservation and cost reduction are facilitated.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a Doherty power amplifier applied in future wireless communication systems. Background technique [0002] In wireless communication systems, the role of power amplifiers in transmitters is becoming more and more important, and bandwidth and efficiency are always two key factors of power amplifiers. In the future, the capacity of wireless communication systems will continue to expand. In order to ensure that the amount of information carried is large enough and has a certain anti-noise capability, it is necessary to perform high-order complex modulation on the signal, which results in a very high peak-to-average ratio of the signal. For signals with a peak-to-average ratio, the efficiency of the saturated operating point of the power amplifier is not of great practical significance. Only by improving the overall efficiency in a certain power fallback are...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F1/07H03F1/42
Inventor 何松柏侯宪允王显飞王朋童仁彬马力游飞
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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