Study on linearization of Ka-band wideband traveling-wave tube amplifer
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摘要: 线性化器是毫米波通信系统中的关键器件，在改善放大器的线性指标及提高通信质量等方面起着至关重要的作用。现阶段国内行波管放大器（TWTA）线性化技术尚不完善，无法满足通信技术发展的应用需求，因此线性化技术的研究刻不容缓。本文提出了一种新的宽频带模拟预失真线性化器结构，用来改善Ka波段TWTA的非线性特性。仿真结果表明，在26～30 GHz频率范围内，输入功率为−20～10 dBm，线性化器的增益扩张≥5.08 dB，相位扩张≥64.81 °。将线性化器与TWTA进行级联测试，中心频率的增益压缩≤3.12 dB，相位压缩≤2.31 °，三阶互调（IMD3）显著提高。Abstract: Linearizer is a key component in the millimeter-wave communication system, it plays an important role in improving the linearity performance of amplifier and communication quality. At present, the development of traveling-wave tube amplifier (TWTA) linearization technology cannot meet the application requirements of communication technology, therefore, the research of linearization technology is very important. In this paper we propose a kind of a new wide-band analog pre-distortion structure used to improve the nonlinear characteristics of Ka-band TWTA. The simulation results show that when the input power changes from −20 to 10 dBm in the frequency range of 26−30 GHz, the gain expansion of the linearizer is greater than 5.08 dB, and the phase expansion exceeds 64.81°. The linearizer and the TWTA are cascaeded for testing. The test results show that the gain compression and phase compression of center frequence is less than 3.12 dB and 2.31° respectively, and the third-order intermodulation (IMD3) improves significantly.
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Key words:
- linearization /
- millimeter-wave /
- broadband /
- analog predistortion /
- traveling-wave tube amplifer
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表 1 电桥的仿真数据
Table 1. Simulation data of the bridge
f/GHz S（3，1）/dB S（4，1）/dB S（1，1）/dB S（2，1）/dB S（3，4）/dB two-branch bridge three-branch bridge four-branch bridge two-branch bridge three-branch bridge four-branch bridge two-branch bridge three-branch bridge four-branch bridge two-branch bridge three-branch bridge four-branch bridge two-branch bridge three-branch bridge four-branch bridge 26 −2.97 −3.63 −3.31 −3.51 −2.68 −3.02 −19.32 −33.79 −24.42 −16.17 −21.46 −18.88 −18.46 −32.36 −19.59 28 −2.42 −3.23 −3.18 −3.85 −2.99 −3.15 −48.48 −33.38 −28.18 −27.92 −26.41 −17.81 −44.82 −31.55 −24.14 30 −2.32 −3.03 −3.31 −4.17 −3.26 −3.07 −20.20 −21.40 −21.27 −22.19 −26.73 −18.47 −19.25 −21.00 −26.81 
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表 2 增益压缩测试数据
Table 2. Test data of the gain compression
IPBO/dB gain compression of TWTA/dB gain compression of linearized TWTA/dB 0 −5.81 −3.12 3 −3.31 −1.06 6 −1.77 −0.36 9 −0.92 −0.18 13 −0.34 −0.10 15 −0.19 −0.07
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表 3 相位压缩测试数据
Table 3. Test data of the phase compression
IPBO/dB phase compression of TWTA/（°） phase compression of linearized TWTA/（°） 0 −33.31 −0.81 3 −23.88 ＋1.6 6 −14.77 ＋2.31 9 −8.39 ＋1.52 13 −3.5 ＋0.79 15 −2.03 ＋0.42
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表 4 IMD3测试数据
Table 4. Test data of IMD3
IPBO/dB IMD3 of TWTA/dB IMD3 of linearized TWTA/dB 3 −10.75 −12.30 4 −11.74 −14.39 6 −13.94 −20.08 9 −17.97 −32.36 13 −24.11 −35.12
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