W频段平面混合集成压控振荡器研究

【作者】 徐建华；

【导师】 谢俊；

【作者基本信息】 电子科技大学 ， 电磁场与微波技术， 2006， 硕士

【摘要】 毫米波振荡源是毫米波系统的核心,是雷达、通信、电子对抗等毫米波系统的关键部件之一。在毫米波系统日益追求小型化、轻量化的今天,毫米波电路的体积、重量面临着新的挑战,毫米波系统全集成化的要求也日益迫切。同时我们也注意到,毫米波电路和系统通常使用在军备和国防上,国外特别是部分军事强国一方面大力发展本国毫米波技术,另一方面对我国实行技术出口限制,大到毫米波设备和系统,小到器件乃至元件。在这种形势下,国内自行开发和研制毫米波电路和系统显得尤为重要。本文就耿氏管、变容管以及键合引线的模型及参数分别进行了阐述,在对谐振回路进行仿真优化的同时,设计完成了一种适用于研制W频段低相噪平面集成VCO的高Q微带谐振器;选用梁氏引线变容二极管、国内自制W频段耿氏管芯片分别作为VCO的频率调谐和负阻元件,借助负阻振荡原理推导出正确的仿真方法,并采用并联振荡方案在ADS中对VCO进行了谐振分析,使之在所需调谐带宽内满足起振和稳定振荡条件。此外,文中还对W频段微带结构直流偏置网络、微带波导过渡等外围电路进行了仿真优化,设计方法和结论对毫米波微带电路设计具有通用的参考价值。最终,在微带线上制成了W频段平面集成体效应管压控振荡器,并进行了测试。文末分别就测试结果中的频偏及功率输出偏低等现象进行分析和讨论,并为相关课题的后续研究提出了几点建议。测试结果表明:该振荡器工作频率98.3～100.6GHz,调谐灵敏度约400MHz/V,线性度优于3.6%,带内最大输出功率0dBm,功率波动±1dB。本文首次采用国产体效应芯片,结合新颖的电路拓扑和组装结构,实现了W频段平面混合集成压控振荡器。从测试结果可以看出,此系列体效应管芯片在工作频率和输出功率上均有较大的发展潜力,随着国内半导体工艺的发展,其性能也将得到进一步提高,结合文中所设计W频段高Q微带谐振器,将来有望在微带上实现W频段低相噪集成压控振荡器。更多还原

【Abstract】 Millimeter-wave oscillators are hearts of millimeter-wave systems, and key components of millimeter-wave systems for radars, communications, electronic-wars and so on. Today, millimeter-wave systems are expected to be more and more compact and light, so reduction of both dimensions and weight of the circuits is facing challenges. Meanwhile, the need of systems’integration is more and more imperious. We have realized that millimeter-wave circuits and systems were used in armament and national defense, so some other countries, especially the stronger in military affairs, on the one hand do their best to develop millimeter-wave technique by themselves, on the other hand prohibit the technique from exporting to china, such as systems, circuits, devices, components and so on. On this special situation it is rather important to exploit millimeter-wave circuits and systems by ourselves.In this paper, the models and parameters of Gunn, varactor and ribbon bond are shown. While simulating the resonant circuits, we finished a microstrip resonance, which has high Q-factor and fits to design W-band low phase noise oscillators. Select beam lead hyperabrupt junction varactor and Gunn die made in china as VCO’s frequency turning component and minus resistance. Correct simulation method is deduced from the principle for negative resistance oscillator. Parallel resonating analysis in ADS for the VCO is presented to make sure it will oscillate in the assumable frequency range. Moreover, the microstrip-waveguide transition and the circuit for DC bias in the VCO are analyzed, and the analysis is generally useful for design of millimeter-wave planar circuit. Finally a W-band microstrip integrated Gunn VCO is designed completely and tested. The phenomenon of frequency excursion and reduction of power output are analyzed and discussed separately in the end of paper and some suggestions for further research are given.Results indicate that its oscillating frequency range is from 98.3GHz to 100.6GHz, turning sensitivity is about 400MHz/V, linearity excels 3.6% and largest output power is 0dBm with ripple of 1 dB.更多还原