Fast settling-time added to the already conflicting requirements of narrow channel spacing and low phase noise lead to Fractional4 divider techniques for PLL synthesizers. We analyze discrete \"beat-note spurious levels from arbitrary modulus di

直接数字频率合成器（Direct Digital synthesizer）是从相位概念出发直接合成所需波形的一种频率合成技术。一个直接数字频率合成器由相位累加器、加法器、波形存储ROM、D/A转换器和低通滤波器（LPF）构成-Direct digital frequency synthesizer (Direct Digital synthesizer) is the concept of direct synthesis from the requirements phase of a wav

摘要:介绍了利用直接数字合成技术产生频率扫描信 号的新方法。利用计数器和相位累加器实现对波形存 储器寻址, 从而产生频率扫描信号序列。该序列通过 数-模转换器和低通滤波器后, 产生出频率扫描信号。 被合成的频率扫描信号的起始频率、 终止频率和扫描 时间可根据需要随意设定,并且可以实现对三者的精 确控制。-Abstract: The use of direct digital synthesis techniques to create a new method of fr