摘 要
本文结合CDMA（码分多址）的技术特点及手机的工作原理，设计针对CDMA手机的手机信-号-屏-蔽-器。论文主要介绍了CDMA的基本概念及技术特点，并着重介绍了手机信-号-屏-蔽-器的基本工作原理及其设计过程，而且对手机信-号-屏-蔽-器电路原理图的各项功能进行了详细的介绍，还突出介绍了电路原理图中8083模块和锁相环的电路结构、功能及其典型应用。论文的主要内容包括：CDMA移动通信系统、手机信-号-屏-蔽-器的工作原理、电路设计与PCB的设计、手机信-号-屏-蔽-器屏蔽器的制作与调试等等。
该手机信-号-屏-蔽-器可应用于各类考场、学校、加油站、教堂、法庭、图书馆、会议中心（室）、影剧院、医院、政府、金融、监狱、公安、军事重地等领域，具有使用范围广泛、有效屏蔽CDMA手机信-号-屏-蔽-器、屏蔽直径大等特点，并且仅对手机****进行屏蔽而不对其它电子设备产生影响，对人体也无任何伤害且操作十分简单。
关键词：CDMA技术；信-号-屏-蔽-器；8083；锁相环
ABSTRACT
This paper combines the technical characteristics of code division multiple access (CDMA) and its working principle, aiming to design a CDMA mobile phone screening device.
The paper mainly introduces the basic concept and technical code division multiple access (CDMA), and emphatically not only introduces the characteristics of the phone signal blockers basic working principle and designing process, and mobile device shielding the circuit principle diagram of the various functions is introduced in detail, but also introduced the circuit principle diagram 8083 module and phase lock loop circuit structure, function and its typical applications. The thesis mainly includes: CDMA mobile communication system, mobile phone screen operating principle, circuit design and PCB design, mobile phone signal blockers and debugging, etc.
The mobile phone signal blockers can be applied to all kinds of examination, schools, churches, station, courts, library, meeting center (room), cinemas, theaters, hospitals and government, financial and military prison, public security, etc, and has a wide range of applications, effectively screen CDMA mobile phone signal, shielding characteristics, such as large diameter of mobile phone signal and shielding and has neither any influence to electronic equipments,nor any harm to human moreover the operation is pretty simple.
Keywords: CDMA technology; Blockers; 8083; Phase-locked loop
手机工作时，是在一定的频率范围内，手机和基站通过无线电波联接起来，以一定的波特率和调制方式完成数据和声音的传输。针对这种通讯原理，信-号-屏-蔽-器在工作过程中以一定的速度从前向信道的低端频率向高端扫描 |
