《高频电子线路》课程设计说明书--乘积型相位鉴频器

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1、武汉理工大学《高频电子线路》课程设计说明书目录1绪论······························································22protel软件简介·····················································33乘积型相位鉴频器·················································53.1乘积型相位鉴频器的组成········································53.1.

2、1MC1496的内部结构·········································53.1.2低通滤波器················································63.2乘积型相位鉴频器的工作原理····································73.2.1乘积型相位鉴频器的原理图··································73.2.2乘积型相位鉴频器的原理分析································73.2

3、.321武汉理工大学《高频电子线路》课程设计说明书相位鉴频器的鉴频特性的定性分析····························94乘积型相位鉴频器的仿真结果·······································114.1仿真电路图···················································114.2网络报表·····················································124.3元件清单··················

4、···································164.4静态工作点···················································174.5输出波形·····················································185总结与心得体会···················································196参考文献··············································

5、···········207本科生课程设计评定表·············································2121武汉理工大学《高频电子线路》课程设计说明书1绪论鉴频是调频的逆过程，广泛采用的鉴频电路是相位鉴频器。其鉴频原理是：先将调频波经过一个线性移相网络变换成调频调相波，然后再与原调频波一起加到一个相位检波器进行鉴频。因此实现鉴频的核心部件是相位检波器。相位检波又分为叠加型相位检波和乘积型相位检波，利用模拟乘法器的相乘原理可实现乘积型相位检波。调频波的特点是振幅保持不变,而瞬时频率随调制信号的大小线形变

6、化，调制信号代表所要传送的信息，我们在分析或实验时，常以低频正弦波为代表。鉴频的目的就是从调频波中检出低频调制信号，即完成频率—电压的变换作用。能完成这种作用的电路被称为鉴频器。相位鉴频器是利用双耦合回路的相位-频率特性将调频波变成调幅调频波,通过振幅检波器实现鉴频的一种鉴频器。它常用于频偏在几百KHz以下的调频无线接收设备中。常用的相位鉴频器根据其耦合方式可分为互感耦合和电容耦合两种鉴频器。调相波的解调电路,是从调相波中取出原调制信号,即输出电压与输入信号的瞬时相位偏移成正比,又称为鉴相器。对于调频波的解调电路来说,是从调频波中取出原调

7、制信号,即输出电压与输入信号的瞬时频率偏移成正比,又称为鉴频器。与调幅接收机一样，调频接收机的组成也大多采用超外差式的。在超外差式的调频接收机中，鉴频通常在中频频率上进行。在调频信号的产生、传输和通过调频接收机前端电路的过程中，不可避免地引入干扰和噪声，它们对FM信号的影响，主要表现为调频信号出现了不希望有的寄生调幅和寄生调频。要消除由寄生调幅所引起的鉴频器的输出噪声，通常在末级中放和鉴频器之间设置限幅器。就功能而言，鉴频器是将输入调频波进行特定的波形变换，使变换后的波形包含反映瞬时频率变化的平均分量，然后通过低通滤波器取出所需解调电压。

8、21武汉理工大学《高频电子线路》课程设计说明书2Multisim软件简介随着计算机技术飞速发展，电路可以通过计算机辅助分析和仿真技术来完成设计。计算机仿真在教学中的应用，代替了大包大揽的试验电