基于multisim14的调频收音机设计(包括各模块的子程序)

上传者: 41254054 | 上传时间: 2019-12-21 20:53:49 | 文件大小: 6.58MB | 文件类型: zip
调频收音机的原理如上图所示,包括高频放大电路、混频电路、本振电路、中频放大电路、鉴频电路以及低频放大电路等。主要技术指标如下: 1、工作频率范围 调频收音机的工作频率范围为88-108MHz,中频频率为10.7MHz。 2、灵敏度 接收机接收微弱信号的能力称为灵敏度,一般用输入电压的大小来表示,接受的信号越小,灵敏度就越高。一般生活中调频接收机的灵敏度为5-30uV。 3、选择性 接收机从各种干扰信号中选出所需要的信号,或衰减不要的信号的能力称为选择性,单位用dB(分贝)表示,dB数越高选择性越好。调频接收机中的中频抗干扰大于50dB。 4、通频带 接收机的频率响应范围称为频率特性或通频带。调频接收机的通频带一般为200KHz。 5、输出功率 接收机的负载输出最大不失真(或非线性失真系数为给定值时)功率称为不失真功率。输出功率应该≥100mW。

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