一种基于AM解调电路的简单点对点通信设计实现

Design and Implementation of a Simple Point-to-point Communication Based on AM Demodulation Circuit

基于通信基带设计制作一种点对点AM调幅波通信解调电路,使得调幅信号能够正确解调出基带信号。设计了包括射频宽带放大器、本振电路、混频电路、包络检波电路、数控衰减器和数字控制电路的方案,为了实现最后输出幅值在1 V±0.1 V范围内,应用了AGC增益控制电路,使用主控器件为STM32F103。调试实验表明:AM调幅波解调电路能够实现对AM调幅波的解调,得到了原始信息;AGC控制解决了AM调幅信号在接收时振幅变化波动较大的问题。本设计方案简单可靠,对点到点通信有参考作用。

A point-to-point AM amplitude modulation wave communication demodulation circuit is designed based on the communication baseband, which enables the amplitude modulation signal to demodulate the baseband signal correctly. The scheme including radio frequency broadband amplifier,local oscillator circuit, mixer circuit, envelope detection circuit, numerical control attenuator and digital control circuit are designed. In order to achieve the final output amplitude in the range of 1 V ± 0.1 V,the AGC gain control circuit is applied, and the main control device is used as STM32 F103. The test shows that the AM amplitude modulation wave demodulation circuit can demodulate the AM amplitude modulation wave and get the original information, and the AGC control solves the problem that the amplitude fluctuation of the AM amplitude modulation signal is greatly fluctuant when the amplitude modulation signal is received. The design scheme is simple and reliable, and has reference value for pointtopoint communication.