毕业论文--lc振荡电路研究.doc

江苏科技大学 本 科 毕 业 设 计（论文） LC振荡电路研究 (the research of LC oscillator circuit) 学 院 电气与信息工程学院 专 业 电子信息工程 摘 要 在通信和电子领域，正弦波振荡器被广泛的应用着，它是无线电发送设备的心脏部分，也是超外差式接收机的主要部分，很多电子测试仪器其核心部分都离不开正弦波振荡器。其中LC振荡电路是最常见的一种能够产生振荡电流的电路，它指用电感、电容组成选频网络的振荡电路，用于产生高频正弦波信号，振荡网络由主网络、选频网络和反馈网络三部分组成。它能够在没有外加激励的情况下，把直流电源共给的功耗转化为我们所需的指定频率和幅度的交流信号源。常见的LC正弦波振荡电路有变压器反馈式振荡电路（互感耦合）、电感三点式振荡电路和电容三点式振荡电路以及两种两种改进型电容三点式振荡网络，分别是克拉泼振荡电路和西勒振荡电路。 本课题是研究几种振荡网络的特性，并利用其特性设计一个好的振荡电路。首先选用multisim12.0软件进行仿真，再进行试验，得出几种电路的特点，再根据具体情况设计电路 关键词：LC振荡电路；选频网络；电容三点式；电感三点式 Abstract In communications and electronic fields,sine wave oscillator is widely used. It’s the heart of the radio transmission apparatus. It’s also the main part of superheterodyne receiver. Many electronic test equipment’s core is inseparable of sinusoidal oscillator .Oscillator circuit is one of the most common current of the circuit to oscillate. It refers that the frequency selective network consists of inductors and capacitors，which used to generate high-frequency sine wave signal. Oscillation Network is made up of the main network, frequency selective network and the feedback network.In the case of having no additional incentive, it can take the the total power consumption of DC power into the AC signal source of specified frequency and amplitude that we need. Common LC sine wave oscillator circuit have transformers feedback oscillation circuit (mutual coupling), three-point oscillator circuit inductance and capacitance three-point oscillator circuit, and two kinds of two kinds of improved capacitance three-point oscillator networks,which are The Clapp oscillator and Seiler oscillator circuit. This topic is aimed at researching several oscillation characteristics of the network and use its properties to design a good oscillator circuit. Firstly,the designer selects multisim 12.0 to simulate. Then, the designer begin to experiment to obtain the characteristics of several circuits.