A novel high effective envelope-tracking amplifier for OFDM systems

2008 International Conference on Electronic Packaging Technology & High Density Packaging Pub Date : 2008-07-28 DOI:10.1109/ICEPT.2008.4607026

Yingliang Li, Jide-Zhao

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引用次数: 1

Abstract

OFDM (orthogonal frequency division multiplex) mobile communication system is so popular in recent because it has so many virtues as effective frequency spectrum, wide-band, high speed rate, etc. But it has so many challenges in technical field, such as the high efficiency of PA (power amplifier) and linearity. RF (radio frequency) amplifier with ET (envelop-tracing) structure is described for OFDM systems in this paper. The first study the ET amplifier model, and then a high-efficiency OFDM amplifier is presented with GaN HEMT (heterostrucutre field-effect transistors), and includes the theoretic analysis and circuit design. Finally, the design circuit is simulated by ADS (advanced design systems) software, and gets the average DE (drains efficiency) of the amplifier is as high as 50% for an OFDM (Wimax) modulated signal with EVM of 2.94% at an average output power of 50 W and gain of 13.0 dB from simulating result. The design has good efficiency and linearity. All of these performances are satisfied with the OFDM systempsilas requirement of RF. This design may be applied for the OFDM systems compare with the standard of OFDM.

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一种新型的高效OFDM系统包络跟踪放大器

OFDM (orthogonal frequency division multiple，正交频分复用)移动通信系统因其具有有效频谱、宽带、高速率等优点而受到近年来的广泛应用。但它在技术领域面临着诸多挑战，如功率放大器的高效率和线性度。介绍了一种用于OFDM系统的ET结构射频放大器。首先对ET放大器模型进行了研究，然后提出了一种采用GaN HEMT(异质结构场效应晶体管)的高效OFDM放大器，包括理论分析和电路设计。最后，利用ADS (advanced design systems)软件对设计电路进行仿真，仿真结果表明，对于EVM为2.94%的OFDM (Wimax)调制信号，在平均输出功率为50 W，增益为13.0 dB的情况下，放大器的平均DE(漏极效率)高达50%。该设计具有良好的效率和线性度。所有这些性能都满足了OFDM系统对射频的要求。与OFDM标准相比，本设计可应用于OFDM系统。

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2008 International Conference on Electronic Packaging Technology & High Density Packaging

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