.2-30mhz Shortwave Radio Receiver Rf Front-end Development

Short-wave radio station possesses extensive military applications as well as civil, being of great value in research and development.The subject comes from the cooperation project"2-30MHz short-wave radio station"between ChengDu Sine Science &Technology Ltd And No.30 Research Institute CECT。The auther was responsible for implementation the RF front-end part of the receiver。The high-intermediate-frequency superheterodyne structure with twice conversions is adopted in the final scheme。With cascaded AGC units the receiver system get a high dynamic range while the linearity of the system is well guaranteed。The paper begins with the deep analysis of receiver parameters. Subsequently, the design methods are introduced about receiver with high linearity and high dynamic range.Then ,the system scheme analysis and proof, implementation of each functional unit, some questions paid more attention in system design and debug are discussed in detail. The ultimate testing results of this subject are represented at last。...