LC调频振荡器详解.doc

通信电子线路课程设计说明书 LC调频振荡器 院 、 部： 电气与信息工程学院 学生姓名： 杨 超 指导教师： 李欣 职称 实验师 学 号： 1230440145 专 业： 通信工程 完成时间： 2015年1月 5日 摘 要 LC正弦波振荡器是各种接收机和发射机中一种常见的电路,由LC谐振回路作反馈电路的反馈型正弦波振荡器。其放大电路主要由晶体管或电子管构成，自振频率基本上决定于谐振回路的电感L和电容C，振荡幅度主要受制于有源电子器件的非线性和电源电压的幅度LC振荡器依L、C在电路中的接法不同而有、哈特莱振荡器、克拉泼振荡器等主要类型LC正弦波振荡器因谐振回路具有很高的选择性，谐振元件L或C的数值调节方便，可借以改变振荡频率，因而为广播、通信、电子仪器等电子设备所广泛采用。 调频电路分为直接调频和间接调频两类。间接调频的优点是载波频率比较稳定，但电路较为复杂，频移小，且寄生调幅较大，通常需要多次倍频使频移增加。 关键词：克拉泼振荡器；直接调频；LC正弦波振荡器；有源电子器件 ABSTRACT LC sinusoidal oscillator is a kind of common all kinds of receiver and transmitter circuit, feedback circuit by LC resonance circuit feedback sinusoidal oscillator. Its amplifying circuit mainly consists of transistors or vacuum tubes, natural vibration frequency is basically determined by the resonant circuit inductance and capacitance C L, oscillation amplitude mainly under the control of the nonlinear of active electronic devices and power supply voltage range, in accordance with the L, C in LC oscillator circuit connection of different and have to take an examination of bi, oscillator, hartley oscillators, main types, such as carat spilt oscillator LC sinusoidal oscillator for resonant circuit has high selectivity, resonant components or L C numerical adjustment is convenient, can be so as to change the oscillation frequency, thus for broadcasting, communications, electronic instruments and other electronic devices are widely used. Frequency modulation circuit is divided into two categories, direct frequency modulation and indirect frequency modulation. The basic principle of direct frequency modulation is the use of oscillation frequency modulation signal directly controlled oscillator, make it reflect the variety regulation modulation signal without distortion. The advantage of direct frequency modulation is easy to get larger deviation, but the central high frequency stability is not easy to do. I