Design And Realization Of RF Front-end Of The High Dynamic Range Broad Band Receiver

In recent years, communications technology was a surprising development, and wireless communications technology is a branch of the most rapidly developing, today, wireless communications technology has been widely applied to various fields of daily life. Among them, research and development of shortwave reception technology has a high value.The subjects come from the Institute of "broadband shortwave receiver", the author of which is responsible for part of the receiver RF front-end development. Use the superheterodyne secondary frequency architecture, combining digital frequency synthesis; basically realize a large dynamic range of receiver RF broadband project required. The receiver RF front-end technology involved in the design process, and with a certain degree of innovation.In this paper, as a focus on RF receiver, in reference to a large number of domestic and foreign literature on the basis of the RF, explore and study the theory and the basic principles of combining shortwave receivers filter design techniques, automatic gain control technology DDS technology, and other key technologies, explore the large dynamic range of broadband RF receiver design and implementation.In this paper, a broadband receiver depth analysis of the key technical indicators, and then introduced the system in large dynamic range, under conditions of high linear design, and the topic in detail in the program. In the design and the realization of specific performance indicators should pay attention. The test results showed that the eventual realization of the design of the system dynamic range requirements, so that the receiver performance can be guaranteed.