变容二极管调频电路毕业设计.docVIP

 PAGE \* MERGEFORMAT 21 目录 摘要……………………………………………………………………………………… 1题目分析………………………………………………………………………… 2系统方案论证……………………………………………………………………… 2.1 电路设计原理……………………………………………………………………… 2.2 电路的设计方案………………………………………………… 2.3 电路设计…………………………………………………………………………… 2.4 主振电路设计原理分析…………………………………………………………… 2.5 变容二极管直接调频电路………………………………………………………… 2.6调频信号分析……………………………………………………………………… 2.7 变容二极管频率调制的原理……………………………???……………………… 3电路工作分析……………………………………………………………………… 3.1 谐振回路总电容…………………………………………………………………… 3.2 调制灵敏度……………………………………………………………… 4. 增加电路稳定度………………………………………………………………… 4.1 震荡回路参数LC………………………………………………………… 4.2温度补偿法…………………………………………………………………… 4.3回路电阻……………………………………………………………………… 4.4增加缓冲级……………………………………………………………… 4.5有源器件参数……………………………………………………………… 4.6高稳定度LC振荡电路……………………………………………………………… 5. 电路元器件参数设置……………………………………………………………………… 5.1 LC震荡电路直流参数设置………………………………………………………… 5.2 变容管调频电路参数设置………………………………………………………… 5.3 放大电路参数设置……………………………………………………………… 5.4 调制信号的幅度计算……………………………………………… 6. 元器件清单………………………………………………………………… 7. 电路调试………………………………………………………………… 8.课程答辩………………………………………………………………… 9.实验心得体会………………………………………………………………… 10.致谢………………………………………………………………… 11.参考文献………………………………………………………………… 摘要 With the increasing use of electronic and communications technology increasing rate. The modern computer technology and the microelectronic technology further union and the development caused the electronic circuit and the communication link appeared two branches. One is the movement toward a more language for the new devices are specially designed. The FM broadcast the merits, broadcasting stations frequency band probably is usually 200~250kHz, Its bandwidth is amplitude modulation broadcasting stations dozens of times, is advantageous for transmits the in the receiver, therefore the tonic train signaling frequency limits in the 30~8000Hz scope. When frequency modulation, may expand the tonic train signaling frequency range to 30~15000Hz, causes the tonic train signaling the frequency spectrum