Dual-mode dual-band high-efficiency Doherty power amplifier

A power amplifier and high-efficiency technology, which is applied in the direction of improving the amplifier to increase efficiency, can solve problems such as narrow bandwidth, achieve cost reduction, reduce incomplete modulation effects, and improve overall performance.

Inactive Publication Date: 2012-11-28
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since Doherty's impedance invertor and impedance transformer are

Method used

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  • Dual-mode dual-band high-efficiency Doherty power amplifier
  • Dual-mode dual-band high-efficiency Doherty power amplifier
  • Dual-mode dual-band high-efficiency Doherty power amplifier

Examples

Experimental program
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Effect test

Embodiment 1

[0044] Equally divided dual-band power splitter 100, such as image 3 As shown, the input RF signal is divided equally, and its design method is based on the branch-line power divider and the pi-type quarter-wavelength line. The working frequency is f 1 , f 2 , n=f 2 / f 1 >1, Z 0 The standard characteristic impedance of the system is 50Ω, and the relative bandwidth δ=(f 2 -f 1 ) / (f 2 +f), if a compact circuit is designed, the electrical lengths of the three microstrip lines are

[0045] θ=π(1-δ) / 2f 1 (1)

[0046] The characteristic impedance is

[0047] Z 1 = Z 0 2 cos ( δπ / 2 ) - - - ( 2 )

[0048] ...

Embodiment 2

[0091] The non-perfect modulation effect at the saturation point can be mitigated by unequal input power. non-equal dual-band power divider 100 such as Figure 7 As shown, its power distribution ratio is K 2 =|S 31 / S 21 | 2 , r is the isolation resistance. The parameters of the dual-band unequal dual-band power divider 100 can be calculated by the following formula.

[0092] Z 1 = K 2 Z 3

[0093] Z 2 = Z 02 - cos 2 θ 0 sin θ 0

[0094] Z 3 = ( K 2 + 1 ) ...

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Abstract

The invention provides a dual-mode dual-band high-efficiency Doherty power amplifier, which comprises a dual-band power divider module, a dual-band input matching module, a main power amplifier, a peak power amplifier, a dual-band output matching module, a dual-band phase compensation line module, a dual-band impedance inverter and a dual-band impedance transformer, wherein the dual-band phase compensation line module comprises a phase compensation line of a main power amplifier branch and a phase compensation line of the peak power amplifier; the phase compensation line of the main power amplifier branch converts the load impedance of the main power amplifier to approach to the optimum efficiency point at a power back-off point; and the phase compensation line of the peak power amplifier makes the output impedance of the peak power amplifier be in an infinite state in a low-power state. The dual-mode dual-band high-efficiency Doherty power amplifier can be simultaneously operated on two communication frequency bands, the input power enters the main power amplifier and the peak power amplifier in a non-equally divided mode, the incomplete modulation effect is reduced, the overall performance of the Doherty is improved, and the dual-mode dual-band high-efficiency Doherty power amplifier can be applied to multimode base stations and software radio and contributes to saving the energy and reducing the cost.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a dual-mode dual-band high-efficiency Doherty power amplifier. Background technique [0002] In modern wireless communication systems, efficiency and linearity are always two key factors for power amplifiers. Communication systems require higher and higher data transmission rates and increasingly tight spectrum resources, leading to efficient but complex modulation methods, which make the signal have a high peak-to-average ratio (PAR). Traditional power amplifiers need to work in a large backoff area to ensure the linearity of communication, which leads to low overall efficiency of the power amplifier. [0003] The Doherty amplifier was first invented by W.H.Doherty in 1936. Doherty power amplifier is one of the commonly used technologies to improve the average efficiency of the transmitter at present. The traditional Doherty structure block diagram is as follow...

Claims

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Application Information

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IPC IPC(8): H03F1/07
Inventor 何松柏谢树义丁炫童仁彬吕亚博游飞
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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