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高速波形产生及频率调制技术研究
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在利用可编程电路实现高速直接数字合成的基础上，提出了一种通过实时改变直接数字合成频率控制字，直接实现波形频率调制的方法。重点对高速相位累加器、FM、扫频、FSK等调制的实现方法进行了分析并基于FPJ进行，数据能够稳定建立，频率合成正确。
关 键 词 任意波形发生器; 直接数字合成; 相位累加器; 频率控制字
Abstract Direct Digital Synthesis is a new kind of frequency synthesizing technology that is widely applied in arbitrary waveform generator. This paper introduces a realization of DDS, which is based on programmable device. It also presented a method of realizing frequency modulation by real-time changing frequency tuning word of high-speed phase accumulator, Frequency sweep, FM and FSK modulation are analyzed and designed. The data can be built stably and the frequency be synthesized is correct.
Key words arbitrary waveform generator; direct digital synthesis; phase accumulator; frequency tuning word
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