摘要
为了实现高性价比、低相噪和低杂散的数字化信号源,提出了以直接数字频率合成芯片AD 9854为核心的设计方案。系统最大限度地挖掘了AD 9854的潜力,将数字信号处理器、可编程逻辑器件和先进先出存储器与AD 9854紧密结合,输出正弦信号的最高频率为110MH z、谐波失真小于-30 dBc。能够完成调幅、调频和频移键控等调制功能。
This article presented a scheme of digital signal source with high performance cost ratio, low phase noise and low spurious noise, using AD9854. DSP, CPLD and FIFO were employed to make full use of AD9854's high performance. The system can output sine signal with maximum frequency of 110 MHz and harmonic distortion less than -30 dBe, along with AM, FM and FSK functions implemented.
出处
《解放军理工大学学报(自然科学版)》
EI
2006年第2期126-129,共4页
Journal of PLA University of Science and Technology(Natural Science Edition)
关键词
直接数字频率合成
数字信号处理器
复杂可编程器件
调制
杂散
相位噪声
DDS(direct digital synthesis)
DSP(digital signal processor)
CPLD(complex programmable logic device)
modulation
spurious spectrum
phase noise