PWM基带数字信号的调制与解调方法研究

The Modulation and Demodulation Methods Research of PWM Baseband Digital Signals

通过分析PWM基带数字信号的调制与解调原理,提出了利用555定时器实现PWM调制,并利用巴特沃斯滤波器来实现解调功能。先利用Multisim10对电路进行仿真设计,确定其实际可行性。然后利用Protel99SE对电路进行PCB设计,再利用刻板机进行PCB刻制,焊上元器件并调试,最后的电路测试结果表明,该电路较好实现了PWM信号的调制与解调。

By analyzing the PWM baseband digital signal modulation and demodulation principle, proposed use of the 555 timer to realize PWM modulation and use of Butterworth filter achieve demodulation functions. The first use MuhisimlO circuit simulation design to determine the actual feasibility. And then use Prote199SE circuit PCB design, reuse rigid machine PCB engraving, welding on components and debugging, the final circuit test results show that the circuit is better to achieve a PWM signal modulation and demodulation.