高输出功率正弦信号发生器  

Sine signal generator with high output power

作　　者：余师倩[1] 张志勇[1] 方力[1] 

机构地区：[1]武汉大学电子信息学院,湖北武汉430079

出　　处：《电子设计工程》2010年第2期50-52,共3页Electronic Design Engineering

摘　　要：基于直接数字频率合成DDFS(Direct Digital Frequency Synthesize)技术,依据调制信号相关原理,设计以DDS集成电路AD9851为核心的正弦信号发生器,可精确输出幅度调节范围为50mVPP～20VPP,频率调节范围100Hz～30MHz的正弦波,还可输出调幅波、调频波、PSK、ASK信号。该设计在宽频带内能获得大幅度的低失真波形。采用多种抗干扰措施以减少噪声并抑制高频自激,通过软件补偿提高频带内输出幅度的平坦度。该系统输出波形谐波失真度小,无杂散动态范围(SFDR)达39.8dBc,功能稳定,操作简便。Based on the technique of direct digital frequency synthesize （DDFS） and the theory of signal modulation,a sinusoidal generator with core chip AD9851 is designed,whose frequency range is 10014z-30MHz and amplitude range is 50 mVPP-20VPP The sinusoidal generator also outputs of FM, AM, PSK and ASK signals.The system design achieves wide amplitued,low distortion wave.Taking anti-interference measures ,and takes the advantage of software compensation, the system exports high accurate waveform,whose SFDR is up to 39.SdBc,and has the stable funtion and convenient operation.

关 键 词：正弦信号 调幅 调频 直接数字频率合成(DDFS) AD9851 

分 类 号：TN76[电子电信—电路与系统]