数字调谐模块解决方案—Ameya360电子元器件平台

Release time:2019-10-22
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source:Ameya360
reading:1974

1、 前言

数字调谐是应用数字电路技术和电调谐技术对收音机与选台有关的调谐回路调谐。电调谐是利用变容二极管的电容值,随其偏适电压而变化的特性来进行。

数字调谐模块解决方案—Ameya360电子元器件平台

通常都采用射频 (RF) 信号传输方式,即把要传输的视频或音频信号调制 (作幅度调制 AM 或频率调制 FM) 到频率较高的射频载波上,从发信端发送出去;在收信端,为了使观众或听众原原本本地看到和听到原来的图象和声音,接收机要将载有我们所希望的图象和声音的载频信号从大量的射频信号中选择出来,然后还要对其进行一系列的处理。

1、 方案概述

Ameya360 数字调谐模块解决方案通过时钟输入采用从信号源上的 BS 信号输入,经过锁相环电路(CD4046)及分频器控制电路(CD4522)即分频比为 N,则从 VCO 振荡输出口得到合成频率为 Nf 信号。把压控振荡器 VCO 的输入端用导线直接连接到相位比较器 2 的比较信号输入端第三引脚 PD12,这时,该电路就是一个基本锁相环电路。本电路采用反馈封锁的办法,实现了使用极少的器件控制着众多批频率(即从 100Hz~99.9KHz)的灵活转换功能。分频比范围控制电路,主要通过改变电阻、电容的值来改变频率合成器分频比的范围。


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