This paper introduces the theory of the phase-locked loop (PLL) and the direct digital synthesis (DDS), a method to improve the precision of DDS and reduce its phase truncation error is also given.
介绍了锁相环(PLL)技术和直接数字式频率合成(DDS)技术的基本工作原理，给出了一种提高DDS输出频率精度及减小其相位截断误差的方法。
According to the theory of phase-locked loop, we use reflected photoelectric sensor to carry out the color recognition.
根据锁相环的原理，使用反射式光电传感器实现了系统的颜色识别。
In this dissertation, theory, model, design and implementation of charge pump phase locked loop frequency synthesizer are lucubrated.
本文围绕电荷泵频率合成器的理论、模型、设计和实现，进行了深入的研究。
Then we briefly explain the basic theory of Phase Locked Loop (PLL) and the basic characteristic of its components.
然后从相位角度分析了锁相环环路模型，给出了相位传递函数；
Then we briefly explain the basic theory of Phase Locked Loop (PLL) and the basic characteristic of its components.
然后从相位角度分析了锁相环环路模型，给出了相位传递函数；
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