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Hybrid pre-distortion linearizer

A linearizer and pre-distortion technology, applied in the direction of improving amplifiers to reduce nonlinear distortion, etc., can solve the problems of small application range and difficulty in obtaining broadband performance in the millimeter wave frequency band, and achieve wide application range, compact structure, and improved linearity Effect

Inactive Publication Date: 2013-09-18
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0014] Judging from the current research results, the existing nonlinear device predistortion linearization technology achievements are only applicable to the same type of power amplifier linearization requirements, and the scope of application is relatively small
KazuhisaYamauchi et al. have studied a series-type transmission-type analog predistortion circuit ["Anovelseriesdiodelinearizerformobileradiopoweramplifiers", by Yamauchi, K.; Mori, K.; Nakayama, M.; Itoh, Y.; Mitsui, Y.; Ishida, O. MicrowaveSymposiumDigest, 1996, IEEEEMTT-SInternational, Volume: 2] and a parallel transmission type analog predistortion circuit ["Amicrowaveminiaturizedlinearizersingaparalleldiodewithabiasfeedresistance", Authors: Yamauchi, K.; Mori, Kazutomi; Nakayama, M.; Mitsui, Y.; Takagi, Tadashi, MicrowaveTheoryandTechniques, IEEETransactions onVolume:45] can only produce predistorted signals suitable for solid-state power amplifiers
And the millimeter-wave reflective predistortion circuit with more complicated structure ["AdesignofK-bandpredistortionlinearizersingreflectiveSchottkydiodeforsatellite TWTAs," Author: Hee-YoungJeong; Sang-KeunPark; Nam-SikRyu; Jeong, Yong-Chae; In-Bok Yom; YoungKim, GalliumArsenideandOtherSemiconductorApplicationSymposium .EGAAS2005.European, vol, no., pp.597, 600, 3-4Oct.2005], multi-generation is suitable for the pre-distortion linearization requirements of vacuum electronic devices, and the 90° electric bridge required in the circuit is an asymmetric structure , it is difficult to obtain broadband performance in the mmWave frequency band

Method used

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Embodiment 1

[0047] When R1=100, R2=200, V1=0.6V~0.8V, V2=0.65V~0.85V, it can be obtained as Figure 4 The gain-magnitude predistortion curves shown and as Figure 5 The gain-phase predistortion curves are shown. It can be seen from the figure that at a frequency of 30GHz, the input power ranges from -20dBm to +20dBm, the amplitude of the network transmission coefficient increases nonlinearly, and the increase range is 2.5dB to 22.5dB; the phase of the network transmission coefficient increases nonlinearly, and the increase range It is 30°~50°.

Embodiment 2

[0049] When V1=0.8V, V2=0.8V, R1=200Ω~400Ω, R2=100Ω~200Ω, it can be obtained as Image 6 The gain-magnitude predistortion curves shown and as Figure 7 The gain-phase predistortion curves are shown. It can be seen from the figure that at a frequency of 30GHz, when the input power ranges from -20dBm to +20dBm, the magnitude of the network transmission coefficient increases nonlinearly, with an increase range of 4dB to 6.5dB; the phase of the network transmission coefficient increases nonlinearly, and the increase range is 30°~35°.

[0050] In the working states of the above two embodiments, by adjusting V1, V2 (or R1, R2) respectively, as the input power increases, the amplitude and phase of the transmission coefficient can increase nonlinearly, which is contrary to the nonlinear characteristics of the traveling wave tube type. It can meet the pre-distortion requirements of millimeter-wave traveling wave tube power amplifiers.

Embodiment 3

[0052] When R1=100, R2=200, V1=0.7V~1.2V, V2=0.35V~0.5V, it can be obtained as Figure 8 The gain-magnitude predistortion curves shown and as Figure 9 The gain-phase predistortion curves are shown. It can be seen from the figure that at the frequency of 30GHz, the input power ranges from -20dBm to +20dBm, the amplitude of the network transmission coefficient increases nonlinearly, and the increase range is 2dB to 10.5dB; the phase of the network transmission coefficient decreases nonlinearly, and the decrease range is -80°~-30°.

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Abstract

The invention discloses a hybrid pre-distortion linearizer with wide application range. The hybrid pre-distortion linearizer comprises a power divider and a synthesizer, wherein output ports of the power divider are in one-to-one connection with input ports of the synthesizer through a series transmission type analog pre-distortion circuit or a parallel transmission type analog pre-distortion circuit. The linearizer synthesizes multiple nonlinear signals with different characteristics to obtain the required spectrum and phase pre-distortion signals, overcomes the shortcomings that independent series and parallel transmission type analog pre-distortion circuits can only produce pre-distortion signals suitable for solid-state power amplifiers and most reflection-type pre-distortion circuits can only produce pre-distortion signals suitable for millimeter wave traveling-wave tube power amplifiers, can realize the nonlinear pre-distortion linearization for the millimeter wave traveling-wave tube power amplifiers and the solid-state power amplifiers, has wide application range, and is suitable for being popularized in the technical field of millimeter wave linearization.

Description

technical field [0001] The invention relates to the technical field of millimeter wave linearization, in particular to a hybrid predistortion linearizer. Background technique [0002] Modern wireless communication systems require larger signal capacity, higher signal transmission rate, and higher communication quality and efficiency, making millimeter wave communication systems with wider operating frequency bands and higher information capacity more and more attention. In millimeter wave communication systems, the key technical bottlenecks are the high cost of millimeter wave power acquisition and the low efficiency of millimeter wave power amplifiers. In a millimeter wave communication system, in order to achieve low cost and high efficiency, and to maximize the performance of the final power amplifier of the system, the final power amplifier is often required to work in a nonlinear state. This will inevitably require linearization of the final power amplifier to meet the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F1/32
Inventor 谢小强张旭阳陈冠军任玉兴赵伟王明周睿
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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