Research on some key technologies of 9 KHz – 3 GHz digital vector network analyzer

The software and digital is the development trend of vector network analysis. Combined with the idea of software radio, this paper presented a design scheme of vector network analyzer and discussed the key technologies and implementation. Firstly this paper studied the principle and composition of vector network analyzer, the overall design of the system hardware was given. Secondly, we discussed the related theories of the design and key technology. The research contents include: The technology of real-time wideband spectrum analysis, Real time dynamic range expanding technology, Wideband digital downconversion Technology, and Variable rate signal processing. The system structure and working process of the key system function had detailedly designed. Through the numerical simulation and experimental verification, we proved the correctness and feasibility of the design scheme.