无线电数字收发电路课程设计.docVIP

摘 要 无线电技术的原理在于，导体中电流强弱的改变会产生无线电波。利用这一现象，通过调制可将信息加载于无线电波之上。当电波通过空间传播到达收信端，电波引起的电磁场变化又会在导体中产生电流。 通过解调将信息从电流变化中提取出来，就达到了信息传递的目的。 无线电技术分为模拟和数字无线电。（模拟在此不讨论） 数字无线电系统与传统的模拟无线电系统的最大区别在于调制信号的特点不同。尽管数字和模拟无线电系统都使用模拟载波，可不同的是，前者使用模拟调制，调制信号是模拟的，后者采用数字调制，则调制信号却是数字的。 和模拟调制一样，数字调制也有调幅、调频和调相三种基本形式，被分别称为振幅键控（ASK）、频移键控（FSK）和相移键控（PSK）。不同的是数字调制除了这三种基本形式以外，还可以派生出多种其它形式；模拟调制是对载波信号参量进行连续调制，在接收端对载波信号的调制参量连续地进行估值，而数字调制都是用载波信号的某些离散状态来表征所传递的信息，在接收端也只要对载波信号的离散参量进行检测。从频率变换的角度来看，ASK属于线性调制，而FSK和PSK属于非线性调制。 Digital radio system and traditional analog radio system the biggest difference is that the characteristics of different signal modulation. Although digital and analog radio system using simulated carrier may be different is that the former use of analog modulation, analog signal modulation, the latter using digital modulation, the modulation of the signal is digital. Modulation and analog, digital modulation also have AM, FM and Phase three basic forms, called amplitude keying (ASK), frequency shift keying (FSK) and phase shift keying (PSK). Unlike the digital modulation In addition to these three basic forms, can be derived from a variety of other forms; analog modulation of the carrier signal parameters of continuous modulation, in the receiving end of the carrier signal modulation parameters for the valuation, and the figures Modulation are using the carrier signal to some discrete state characterized by the transmission of information, also in the receiving end as long as the carrier signal of discrete parameters for testing. From the perspective of the frequency transform, ASK modulation is linear, and the FSK and PSK modulation is nonlinear. 目 录 摘要 …………………………………………………………………… 1 前言 …………………………………………………………………… 3 方案设计 ……………………………………………………………… 4 芯片介绍 ……………………………………………………………… 4 发射电路 ……………………………………………………………… 6 接收电路 ……………………………………………………………… 8 电源电路 ……………………………………………………………… 10 总结 …………………………………………………………………… 11 参考文献 ……………………………………………………………… 11 使