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%.
作者
朱健
周建烨
Zhu Jian;Zhou Jianye(NO.41Research Institute of CETC,Bengbu 233006,China)
出处
《电子测量技术》
2019年第7期18-23,共6页
Electronic Measurement Technology
基金
国家科技重大专项"毫米波5G信号源研发"(2018VX03001026)资助
中国电科技术创新项目"微波毫米波大带宽大规模MIMO测试技术研究"资助
关键词
矢量信号发生
变频滤波
可调谐滤波
矢量调制校准
vector signal generation
frequency conversion filter
tunable filter
vector modulation calibration
