宽带微波矢量信号发生器的设计讨论
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摘要
针对国内外相应产品的技术状态和国防装备对电子对抗的测试需求,设计了一种宽带微波矢量信号发生器。先在300 MHz中频载波上实现矢量调制,经过射频变频滤波将矢量信号频率扩展到4 GHz,在此基础上,再经过微波变频滤波最终将频率扩展到18 GHz。射频变频滤波采用电可调谐微带带通滤波器,微波变频滤波采用开关带通滤波组件,做到通带内损耗小、纹波小、群时延特性好、带外抑制好,保持矢量信号的调制质量和频谱纯度。采用精确的内部校准电压用于矢量调制器的校准,消除调制通道的剩余载波、正交偏置、I/Q幅度不平衡和变频通道带来的影响,保证在整个频率范围内和不同工作温度下矢量信号的性能。实验表明信号发生器频率范围可达300 kHz～18 GHz,杂散小于-30 dBc,误差矢量幅度小于4%。
Aim at technical status of corresponding products at home and abroad, and test requirements for defense equipment against electronic countermeasures, a wideband microwave vector signal generator is designed. First, vector modulation is implemented on 300 MHz intermediate frequency carrier, the frequency of vector signal is expanded to 4 GHz through RF converting and filtering, On the basis, after micromave frequency converting and filtering, the frequency is extended to 18 GHz. A electrically tunable microstrip filter is used for RF filtering, switching band pass filter module is used for microwave filtering, it can achieve low loss, small ripple, good group delay and good rejection outside band, maintaining modulation quality and spectral purity of vector signals. Calibration of vector modulator using precise internal calibration voltage, eliminating the residual carrier, quadrature offset, I/Q amplitude imbalance of modulation channel and the influence of frequency conversion channel, ensure the quality of vector signals in the whole frequency range and at different operating temperatures. Experiments show that the frequency range of signal generator can reach 300 kHz～18 GHz, stray is less than-30 dBc, error vector magnitude is less than 4%.
Aim at technical status of corresponding products at home and abroad, and test requirements for defense equipment against electronic countermeasures, a wideband microwave vector signal generator is designed. First, vector modulation is implemented on 300 MHz intermediate frequency carrier, the frequency of vector signal is expanded to 4 GHz through RF converting and filtering, On the basis, after micromave frequency converting and filtering, the frequency is extended to 18 GHz. A electrically tunable microstrip filter is used for RF filtering, switching band pass filter module is used for microwave filtering, it can achieve low loss, small ripple, good group delay and good rejection outside band, maintaining modulation quality and spectral purity of vector signals. Calibration of vector modulator using precise internal calibration voltage, eliminating the residual carrier, quadrature offset, I/Q amplitude imbalance of modulation channel and the influence of frequency conversion channel, ensure the quality of vector signals in the whole frequency range and at different operating temperatures. Experiments show that the frequency range of signal generator can reach 300 kHz～18 GHz, stray is less than-30 dBc, error vector magnitude is less than 4%.
引文
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[2] 倪蕤.C波段矢量信号发生器的设计[D].南京:东南大学,2016.
[3] 郑畅.R&S射频上变频器扩展矢量信号发生器频率[J].半导体信息,2014(3):15-16.
[4] 蔡昂.基于FPGA的2.4 GHz频段射频矢量信号源的设计与实现[D].南京:东南大学,2015.
[5] 刘亮,何攀峰,台鑫.矢量调制在相干多通道信号发生中的应用研究[J].国外电子测量技术,2015,34(11):48-52.
[6] 石博文.矢量信号源输出电路的研究与实现[D].成都:电子科技大学,2016.
[7] 黄晓栋.电可调谐滤波器的研究与设计[D].南京:南京航空航天大学,2017.
[8] 杨赤如,刘亚宁,陈晓阳.LC电调带通滤波器的设计[J].真空电子技术,2009(6):44-47.
[9] 孙照清.双通带电调微带滤波器的设计研究[D].哈尔滨:哈尔滨工程大学,2016.
[10] 周研,刘祖深,陈应兵.一种新型可调谐微带带通滤波器的设计[J].电子测量与仪器学报,2010,24(9):866-871.
[11] 艾明贵,梁显锋.一种小型化的超宽带微带带通滤波器的设计[J].电子设计工程,2015,23(24):113-115.
[12] 杨玲玲.宽带小型化滤波器的研究设计[D].武汉:华中科技大学,2017.
[13] 陈斌.数字调制信号误差矢量幅度校准研究[J].宇航计测技术,2009,29(5):24-28.
[14] 周建烨.正交调制器的校准设计[J].电子质量,2010(3):4-7.
[15] 何仁伦,李旭鹏,熊金旺,等.模拟正交调制误差数字校正方法[J].电子信息对抗技术,2014,29(5):74-77.
[16] 肖鹏,王青松.宽带数字矢量调制通道的校准与补偿[J].现代电子技术,2009,32(7):55-57,61.