晶体管混频器课程设计说明书

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With the development of society， the modernization of communication in our life becomes more and more important. Mixer in communication engineering and radio technology， widely used， the mixer is high frequency integrated circuit receiving system essential components. To transmit baseband signal to go through frequency conversion into a high frequency modulated signal， can in the air， wireless transmission， at the receiving end receives the modulated signal to demodulate the received useful signal， however in the demodulation process， receives the modulated high frequency signal to go through frequency conversion， into the corresponding intermediate frequency signal， this will be used mixer. Its principle is to use a multiplication device will be local oscillation signal and modulated signal by frequency selective circuit multiplication， choose the difference frequency term (MF )， in a superheterodyne receiver， mixer， a wide range of applications， such as: AM radio receiver will be modulated amplitude signal 535K 1605KHZ to become 465KHZ intermediate frequency signal; and mobile communication a mixer， a two mixer etc.. Therefore， the mixer circuit is the application of electronic technology and radio professional must grasp the key circuit.

Key words mixer；intermediate frequency signal；frequency selective circuit

目 录

-、设计任务与要求................................................1
二、总体方案.........2
三、设计内容.........5
3.1电路工作原理..........................................................5
3.1.1 LC正弦波振荡器................................5
3.1.2模拟乘法器电路 ..............................................7
3.1.3选频﹑放大电路 ..........................................................................8
3.2 仿真结果与分析...................11
结束语..............................................12
致谢....................................................13
参考文献.............................14
附录..15