UHF前馈功率放大器的研究
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摘要
在现代微波无线通信系统中,信息传输正朝着多载波、大容量、高速度方向迅猛发展,通信系统对射频部件的线性提出了更高的要求。尤其是功率放大器,其线性程度将直接影响系统的性能。前馈法是目前微波通信领域研究较多的线性化技术。
本文介绍了880MHz 前馈功率放大器的工作原理;利用ADS 仿真软件完成了系统仿真及各部件的指标分配;根据系统中各部件的指标要求进行了单独设计并加工出产品进行测试。文中讨论并分析了在设计前馈功率放大器时可能遇到的问题以及可采用的解决措施。
当系统的工作环境发生变化时,放大器的参数会因此发生改变,从而造成前馈修正环路的误差。鉴于此,本文在传统前馈功率放大器中增加了实时检测系统,预留了最小功率检测法自适应控制器接口,为最终实现自适应前馈功放打下了坚实基础。
最终实现了功率放大器的前馈线性化实验,其双音测试表明:放大器的三阶交调失真改善了26dB。
In the system of modern wireless communication, the transmission ofinformation is developing toward multi-carrier, great-capacity and high-speed. This needs the RF components to provide higher linear in the systemsof communication. Especially the linearity of power amplifier will affectthe performance of the whole system. Feed-forward power amplifiers aremore concerned by RF engineers because of its high linearity and stability,and especially because it’s universal to communication systems.
This paper introduces the principle of the feed-forward amplifiers,studies its working process and achieves the analysis and simulation ofthe system. In the real operation, the working states are influenced bytemperature, vibration, humidity and working hours, etc. So a detectablesystem is introduced to feed-forward amplifier, which indicates theoutput distortion of the amplifier.
In the paper, the application of feed-forward amplifier is described.Results are given for a series of two-tones inter-modulation distortionmeasurements. It is shown that a 26dB improvement in the inter-modulationmargin can be achieved.
本文介绍了880MHz 前馈功率放大器的工作原理;利用ADS 仿真软件完成了系统仿真及各部件的指标分配;根据系统中各部件的指标要求进行了单独设计并加工出产品进行测试。文中讨论并分析了在设计前馈功率放大器时可能遇到的问题以及可采用的解决措施。
当系统的工作环境发生变化时,放大器的参数会因此发生改变,从而造成前馈修正环路的误差。鉴于此,本文在传统前馈功率放大器中增加了实时检测系统,预留了最小功率检测法自适应控制器接口,为最终实现自适应前馈功放打下了坚实基础。
最终实现了功率放大器的前馈线性化实验,其双音测试表明:放大器的三阶交调失真改善了26dB。
In the system of modern wireless communication, the transmission ofinformation is developing toward multi-carrier, great-capacity and high-speed. This needs the RF components to provide higher linear in the systemsof communication. Especially the linearity of power amplifier will affectthe performance of the whole system. Feed-forward power amplifiers aremore concerned by RF engineers because of its high linearity and stability,and especially because it’s universal to communication systems.
This paper introduces the principle of the feed-forward amplifiers,studies its working process and achieves the analysis and simulation ofthe system. In the real operation, the working states are influenced bytemperature, vibration, humidity and working hours, etc. So a detectablesystem is introduced to feed-forward amplifier, which indicates theoutput distortion of the amplifier.
In the paper, the application of feed-forward amplifier is described.Results are given for a series of two-tones inter-modulation distortionmeasurements. It is shown that a 26dB improvement in the inter-modulationmargin can be achieved.
引文
[1] 张煦;宽带无线通信的发展趋势;电信快报,2002(8):3-4。
[2] 基于预失真技术的射频功率放大器线性化研究; 毛文杰;浙江大学博士学术论文。Xue.H,M.Beach,and J.McGeehan,“Non-linearity Effects on Adaptive Antennas,”IEE 9th International Conference on Antenna and Propagation,Vol.1,Eindhoven,The Netherlands,April 1995:352-355.
[3] Black.H.S,“Translating System,”U.S Patent 1686972,Issued 9 October 1928.
[4] 吴礼群,钱万成;微波前馈功率放大技术;固体电子学研究与进展,Vol.19,No.3; Aug,1999.
[5] Stephen A。Maas,“Nonlinear Microwave and RF Circuits,”Second Edition;。
[6] 王惠功等编译;非线性微波毫米波电路分析与设计。
[7] 孙莉;宽带前馈功率放大器的研究;北京工业大学理学硕士论文。
[8] Yasunori Suzuki,Tetsuo Hirota,“Highly efficient feed-forward amplifier using a class-f doherty amplifler ”Microwave Symposium Digest, 2003 IEEE MTT-S
[9] Volker Janssen,RolandMinihold,“频谱分析原理”,ROHDE&SCHWARZ(罗德与施瓦茨公司)。
[10] Boyd S,“Multitone Signals with Low Crest Factor,”IEEE Transactions on Circuit and System,Vol.33,October 1986:1018-1022.
[11] Stephen J.Grant, James K.Cavers,“A DSP Controlled Adaptive Feedforward Amplifier Linearizer’”School of Engineering Science, Simon Fraser University, July 1996.
[12] Sanggee Kang,Unghee Park,Kyunghee Lee,“Adaptive Feedforward Amplifier Using Pilot Signal ”, Electronic and Telecommunication Research Institute.Chungnam National University.
[13] Sanggee Kang,Ungnee Park,Kyungnee Lee,“Adaptive feedforward amplifier using digital controller,”Vehicular Technology Conference, 2003. VTC 2003-Spring. The 57th IEEE Semiannual
[14] M.E.Gadring.H.Arthaber and G.Magerl,“Loop controller for a feedforward amplifier minimizing the measured power signal,”Radio and Wireless Conference, 2003.
[15] 张玉兴;射频模拟电路;电子工业出版社,2002。
[16] 李辉;1.8GHz 前馈功率放大器的仿真实现;电子科技大学硕士学位论文。
[17] 顾其诤等;微波集成电路设计;人民教育出版社,1978。
[18] 王琳;数字移项器的小型化设计;电子科技大学硕士学位论文。
[19] 刘建更;电调衰减器及其应用;半导体情报,第32 卷,第4 期,1995 年8 月。
[20] KAI CHANG,“Microwave Solid-State Circuits and Applications”.
[21] Kisuk Yoo, Sanggee Kang, Jae-Ick Choi, Jong-Suk Chae, “Adaptive feed-forward linear power amplifier(LPA) for the imt-2000 frequency band”, Circuits and Systems, 1999. ISCAS '99. Proceedings of the 1999 IEEE International Symposium on.
[22] Y.K.G.Hau, V.Postoyalke and J.R.Richardson, “Compensation of Amplifier Nonlinear Phase Response to Improve Wideband Distortion Cancellation of Feedforward Amplifiers”,Electronics Letters.1997,33(6):500-502.
[2] 基于预失真技术的射频功率放大器线性化研究; 毛文杰;浙江大学博士学术论文。Xue.H,M.Beach,and J.McGeehan,“Non-linearity Effects on Adaptive Antennas,”IEE 9th International Conference on Antenna and Propagation,Vol.1,Eindhoven,The Netherlands,April 1995:352-355.
[3] Black.H.S,“Translating System,”U.S Patent 1686972,Issued 9 October 1928.
[4] 吴礼群,钱万成;微波前馈功率放大技术;固体电子学研究与进展,Vol.19,No.3; Aug,1999.
[5] Stephen A。Maas,“Nonlinear Microwave and RF Circuits,”Second Edition;。
[6] 王惠功等编译;非线性微波毫米波电路分析与设计。
[7] 孙莉;宽带前馈功率放大器的研究;北京工业大学理学硕士论文。
[8] Yasunori Suzuki,Tetsuo Hirota,“Highly efficient feed-forward amplifier using a class-f doherty amplifler ”Microwave Symposium Digest, 2003 IEEE MTT-S
[9] Volker Janssen,RolandMinihold,“频谱分析原理”,ROHDE&SCHWARZ(罗德与施瓦茨公司)。
[10] Boyd S,“Multitone Signals with Low Crest Factor,”IEEE Transactions on Circuit and System,Vol.33,October 1986:1018-1022.
[11] Stephen J.Grant, James K.Cavers,“A DSP Controlled Adaptive Feedforward Amplifier Linearizer’”School of Engineering Science, Simon Fraser University, July 1996.
[12] Sanggee Kang,Unghee Park,Kyunghee Lee,“Adaptive Feedforward Amplifier Using Pilot Signal ”, Electronic and Telecommunication Research Institute.Chungnam National University.
[13] Sanggee Kang,Ungnee Park,Kyungnee Lee,“Adaptive feedforward amplifier using digital controller,”Vehicular Technology Conference, 2003. VTC 2003-Spring. The 57th IEEE Semiannual
[14] M.E.Gadring.H.Arthaber and G.Magerl,“Loop controller for a feedforward amplifier minimizing the measured power signal,”Radio and Wireless Conference, 2003.
[15] 张玉兴;射频模拟电路;电子工业出版社,2002。
[16] 李辉;1.8GHz 前馈功率放大器的仿真实现;电子科技大学硕士学位论文。
[17] 顾其诤等;微波集成电路设计;人民教育出版社,1978。
[18] 王琳;数字移项器的小型化设计;电子科技大学硕士学位论文。
[19] 刘建更;电调衰减器及其应用;半导体情报,第32 卷,第4 期,1995 年8 月。
[20] KAI CHANG,“Microwave Solid-State Circuits and Applications”.
[21] Kisuk Yoo, Sanggee Kang, Jae-Ick Choi, Jong-Suk Chae, “Adaptive feed-forward linear power amplifier(LPA) for the imt-2000 frequency band”, Circuits and Systems, 1999. ISCAS '99. Proceedings of the 1999 IEEE International Symposium on.
[22] Y.K.G.Hau, V.Postoyalke and J.R.Richardson, “Compensation of Amplifier Nonlinear Phase Response to Improve Wideband Distortion Cancellation of Feedforward Amplifiers”,Electronics Letters.1997,33(6):500-502.