超外差接收机中频放大器电路设计_大学生毕业设计（论文）.doc

超外差接收机中频放大器电路设计 摘 要 本课Abstract This topic research the superheterodyne receiver intermediate frequency amplifier circuit. Superheterodyne receiver is the use of local produce shock wave mixing with the input signal, then the frequency of the input signal is converted into a certain frequency method. This method can adapt to the remote communication for the needs of the high frequency signal and weak signal reception. In 1919, scientists using the superheterodyne principle into a superheterodyne receiver. In this paper, the structure of receiver and superheterodyne receiver made a detailed discussion of intermediate frequency amplifier circuit, principle, performance parameters of some of the main modules, and design the simulation operations such as do the relevant explanation. This paper is divided into five chapters: The first chapter is an introduction part, it mainly introduces is the subject of meaning and the background of the current research status. Chapter ii of the present stage using more kinds of receiver is introduced in detail. Finally comprehensive analysis of the performance index and with the demand of this topic, determine the use of superheterodyne receiver structure. After used in the design of this subject are introduced to the Multisim software.At the same time the superheterodyne receiver part of the circuit design and simulation. The third chapter is the research and test of mixer. First mixer on the working principle of mixer and the existing structure have made detailed description, through the analysis, using balanced mixer (analog multiplication mixer), at the same time, some of these parameters are simulated. The fourth chapter of intermediate frequency amplifier circuit design and simulation. According to the required parameters in subject, intermediate frequency amplifier circuit design conforms to the subject. use Multisim software on its dc, bias circuit and the stability of circuit simulation. The finally chapter is the conclu