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数字频率,合成器,的设计

时间:2016-09-27 11:47来源:代写论文 作者:论文网 点击:
摘 要 频率合成器是无线通信系统中一个很重要的模块,用于产生一系列与参考信号具有同样精度和稳定度的频率信号,为调制解调提供基准的本地振荡信号。频率合成器设计的优劣直接影响到无线通信收发机的性能和成本,故高效合理
摘 要
频率合成器是无线通信系统中一个很重要的模块,用于产生一系列与参考信号具有同样精度和稳定度的频率信号,为调制解调提供基准的本地振荡信号。频率合成器设计的优劣直接影响到无线通信收发机的性能和成本,故高效合理的实现方式一直是很多设计者研究的课题。  
由频率合成技术获得的信号源具有高频率稳定度和准确度,并且能方便地改变频率,其中频率合成方法有直接式和间接式两种。锁相环频率合成器是目前应用较为广泛的一种频率合成技术。本文主要介绍74HC4046锁相环数字频率合成器的构成电路以及原理。74HC4046锁相环数字频率合成器主要由振荡源电路、固定分频器,1/N可预置分频器以及锁相环电路构成。其功能是将一给定频率的输入信号经频率合成后产生一系列的N 倍频率的输出信号。此频率合成器具有较高的可选择性与实用性等特点。该方案简单易行且易于调试,具有较高的实用价值。
关键词:频率合成,锁相环,74HC4046,分频器
 
 
 
 
 
 
 
 
 
 
 
 
Design of digital frequency synthesizer
Abstract
The frequency synthesizer is a very important module in the wireless communication system,It generates a series of discrete signals with the same accuracy and stability as the reference signal,and provides a reference for the frequency conversion local oscillating signal.The pros and cons of the frequency synthesizer design has a direct influence on the wireless communication transceiver performance,cost,so the way to the designer challenge.
The signal source synthesized by the frequency synthesizer has the high frequency stability and accuracy,and can change the frequency easily, and the synthetic method of frequency has two kinds of direct and indirect.The PLL frequency synthesizer is a widely used frequency synthesis technology at present.. This paper mainly introduces the circuit and principle of 74HC4046 PLL digital frequency synthesizer.The 74HC4046 PLL digital frequency synthesizer is composed of the oscillating source, the fixed frequency divider, the 1/N of the preset frequency divider and the PLL circuit.Its function is to generate a series of output signals of N times after frequency of the input signal of a given frequency.This frequency synthesizer has the characteristics of stability, accuracy,high selectivity and practicality.This scheme is simple and easy to debug,and has high practical value.
KEY WORDS: Frequency synthesis,phase locked loop,74HC4046,frequency divider


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