Ka波段行波管线性化器研究

发布时间：2018-05-25 15:04

本文选题：行波管放大器 + 模拟预失真　；参考：《真空科学与技术学报》2017年06期

【摘要】：模拟预失真技术是补偿行波管放大器非线性失真的一种重要方法,为了精确补偿放大器的非线性失真,需要同时保证预失真器的幅度和相位特性满足补偿要求,然而目前大多数的预失真器无法实现幅度和相位特性独立调节使得这个要求难以满足。本文提出了一种工作于Ka波段的模拟预失真线性化器,它采用矢量合成式结构,通过同时调节两条支路中二极管的偏置电压可以实现幅度和相位特性的独立调节。该预失真器工作于29~31 GHz,根据理论分析和仿真结果加工制作了实际电路并进行了测试,测试结果表明:在30 GHz时,该预失真器可以在相位扩张恒定的情况下在2.2~9.1 d B范围内调节增益扩张,同时可以在增益扩张恒定的情况下在19.7°~42.5°的范围内调节相位扩张。与行波管放大器的联测结果表明,线性化后的行波管放大器的非线性失真明显降低,在输出功率回退6 d B时,三阶互调系数提高了约9 d B。
[Abstract]:Analog predistortion is an important method for compensating the nonlinear distortion of TWT amplifiers. In order to accurately compensate the nonlinear distortion of TWT amplifiers, it is necessary to ensure that the amplitude and phase characteristics of the predistortors meet the compensation requirements. However, at present, most predistortors can not adjust the amplitude and phase characteristics independently, which makes it difficult to meet this requirement. In this paper, an analog predistortion linearizer working in Ka-band is proposed. It adopts a vector synthesis structure, and the amplitude and phase characteristics can be adjusted independently by simultaneously adjusting the bias voltage of the diodes in the two branches. The predistorter works at 291GHz. According to the theoretical analysis and simulation results, the practical circuit is fabricated and tested. The test results show that: at 30 GHz, The predistorter can adjust the gain expansion in the range of 2.2t 9.1 dB and 19.7 掳/ 42.5 掳when the phase expansion is constant, and the gain expansion can be adjusted in the range of 19.7 掳/ 42.5 掳. The test results with the TWT amplifier show that the nonlinear distortion of the TWT amplifier after linearization is obviously reduced, and the third-order intermodulation coefficient increases by about 9 dB when the output power recovers 6 dB.
【作者单位】：信息工程大学信息系统工程学院;
【基金】：国家核高基重大科技专项
【分类号】：TN124;TN722

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