一种基于包络检测的ASK调制解调电路设计  

Design of ASK modulating and demodulating circuit based envelope detection

作　　者：刘新红[1] 

机构地区：[1]北京信息职业技术学院电子工程系,北京100015

出　　处：《现代电子技术》2014年第6期35-38,共4页Modern Electronics Technique

摘　　要：针对ASK数字调制方式,设计了一种基于包络检测调制解调电路。调制电路采用模拟调幅调制方法,用模拟乘法器AD734将被调制二进制数字信号和载波相乘产生调制信号实现调制。解调电路采用包络检测法,用运放LMH6658MA将正弦信号放大限幅转方波信号,用比较器整流电路对信号整流,然后用低通滤波器滤去载波,最后通过微分电路和比较器LM139对信号整形获得解调出的二进制数字信号,从而实现解调。通过Proteus对设计的电路进行仿真验证,结果证明,此电路结构简明,具有大的信号幅度、频率动态范围。According to ASKdigital modulation mode,a new type of modulating and demodulating circuit was designed.The method of anolog AM modulation is adopted in modulating circuit. Anolog multiplier AD734 is used to realize that the carrieris multiplied by the modulated binary digital signal so that the modulation is completed. The method of envelope detection is ad-opted in demodulating circuit. The operational amplifier LMH6658MA is used to realize that the sine signal amplification and am-plitude-limit is converted into square wave signal. At the same time,the signal is rectified with the rectifying circuit in compara-tor. And then,the carrier is filtered by a low-pass filter. At last,the signal is reshaped by differential circuit and comparatorLM139 to get the demodulated binary digital signal,so that the demodulation is completed. The designed modulating and demod-ulating circuits were simduated and verified by Proteus. The result shows that the circuits have characteristics of simplicity,large dynamic range in signal amplitude and frequency.

关 键 词：ASK 调制电路 解调电路 PROTEUS仿真 

分 类 号：TN914-34[电子电信—通信与信息系统]