锁相环是一种能跟踪输入信号相位的闭环自动控制系统。应用在无线遥控的各个领域。以往都是通过模拟电路搭建的锁相环系统，工作相当不够稳定而且容易受高频信号的干扰。集成环路部件以其低成本、性能优良、使用简便而得到应用。它在频率调制与解调、频率合成，遥控系统，频率的编解码和译码等诸多方面均得到了利用。本系统研究了集成锁相环CD4046在频率的调制与解调方面的应用。
无线遥控技术就是发射机把控制的电信号先编码，调制，然后转换成无线电波发送出去。接收机收到载有信息的无线电波接收，放大，解码，得到原先的控制电信号，这个电信号再进行功率放大用来驱动相关的电气元件，实现无线的遥控。无线遥控和无线传输系统与有线相比提高了移动自由度。由此使无线遥控装置和无线传输系统在工业领域的应用越来越多。相对电缆连线的优点在于安装成本低而且提高了灵活性并降低了维护成本。
基于锁相环的和无线技术的优良特性，本体统研究了利用锁相环CD4046锁相解调出与发射相对应的信号，然后利用双稳态电路的记忆特性来保持信号，最后在经过驱动电路推动继电器或者电机工作。系统工作可靠成本低，可以用于制作各种无线遥控装置。
关键字： 锁相环，CD4046，无线遥控，双稳态
Phase locked loop is a kind of can keep track of the input signal phase closed-loop automatic control system. Used in every field of wireless remote control. Ever is through the analog circuits build phase lock loop system, work quite enough stable and vulnerable to the high frequency signal interference. Integrated circuits with its low cost, It in frequency modulation and demodulation, frequency synthesis, remote control system, frequency codec and decoding have got many aspects, such as using. This system is studied in PLL CD4046 integrated frequency modulation and demodulation applications.
Wireless remote control technology is the control signal transmitter, then first coding, modulation convert radio waves to send out. Receiver receive radio reception with information, amplified, decoding, get the original control signals, the electrical signals to power amplifier to drive the relevant electrical components, realize the wireless remote control. Wireless remote control and wireless transmission system and improve the mobile freedom than cable. Thus making wireless remote control device and wireless transmission system in the industrial field of applied more and more. The advantages of relative cable connection is low cost and improve the installation flexibility and reduce maintenance costs.
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