| 一种用于预失真线性化器的宽带匹配技术 |
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| 引用本文： | 汪永飞, 韩培胜, 胡卿, 等. 一种用于预失真线性化器的宽带匹配技术[J]. 强激光与粒子束, 2019, 31: 123003. doi: 10.11884/HPLPB201931.190128 |
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| 作者姓名： | 汪永飞 韩培胜 胡卿 陈欣鹏 周东方 |
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| 作者单位： | 1.信息工程大学，郑州 450001;;2.北方计算研究所，北京 100161;;3.陆军炮兵防空兵学院 士官学校, 沈阳 110000 |
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| 基金项目： | 国家核高基重大科技专项(201501010101-003) |
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| 摘 要： | 由于放大链路的增益波动以及不同频点之间非线性特性的差异，预失真器难以在不同的频点同时实现非线性特性匹配，即令整个频带内不同频点的线性度指标同时满足要求。由于预失真器和放大器之间的非线性失配，放大器在某些频点的非线性特性还会恶化。本文从线性化器与预失真器的宽带匹配出发，讨论了预失真线性化器与行波管放大器宽带匹配的条件以及非线性失配所带来的影响，当增益失配误差不大于1 dB时，在行波管放大器自身的三阶交调值不大于40 dB的非线性动态范围内，三阶交调下降幅度最大值为4.1 dB；通过采用级联增益补偿电路的方式，降低链路增益波动，实现预失真器和放大器的非线性匹配，真正拓展预失真线性化器的工作带宽。
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| 关 键 词： | 预失真 行波管放大器 非线性匹配 宽带匹配 级联增益补偿 |
| 收稿时间： | 2019-04-24 |
| 修稿时间： | 2019-08-15 |
Wideband matching technology used for predistortion linearization |
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| Wang Yongfei, Han Peisheng, Hu Qing, et al. Wideband matching technology used for predistortion linearization[J]. High Power Laser and Particle Beams, 2019, 31: 123003. doi: 10.11884/HPLPB201931.190128 |
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| Authors: | Wang Yongfei Han Peisheng Hu Qing Chen Xinpeng Zhou Dongfang |
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| Affiliation: | 1. Information Engineering University, Zhengzhou 450001, China;;2. The North Institute of Computing, Beijing 100161, China;;3. Warrant Officer School, Army Artillery Air Defense Academy, Shenyang 110000, China |
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| Abstract: | Due to the gain fluctuation and nonlinear characteristic variation of the TWT amplifier chain, predistorter cannot compensate the nonlinearities at different frequencies within the working band, thus nonlinear mismatch might occur and nonlinearity of TWTA could get worse at some frequencies. The wideband linear match theory of predistorter with TWTA is put forward, and the influence of nonlinear mismatch is discussed. Predistorter cascaded with gain compensation unit can flatten the gain fluctuation and match the nonlinearity of TWTA, truly broaden the linear working band of LTWTA. |
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| Keywords: | predistortion travelling wave tube amplifier nonlinearity match wideband match cascade gain compensation |
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