After briefly introducing the correlated technical basis of analog wireless video transmission system , the paper mainly focuses on the theory of oscillator and pll ( phase lock loop ) 论文首先简要介绍了模拟无线视频传输系统的相关技术基础,然后着重讨论了振荡器和锁相环的相关理论。
In this paper the author introduce the basic theory of phase locked loop ( pll ) and frequency synthesizer technology , and discusses the theory and implement of fnpll frequency synthesizer 本文介绍了锁相环和频率合成技术的基础理论，并对分数分频频率合成器及其实现技术进行了探讨。
It has the advantage of high frequency resolution and low phase noise when compared with traditional integer - n phase locked loop ( npll ) frequency synthesis 分数分频( fnpll )频率合成器则是近年来出现的一种新技术，它与传统的整数分频频率合成器相比具有频率分辨率高、相位噪声低等优点。
A virtual phase difference meter is developed based on the principle of phase difference measurement of phase - locked loop , and the main requirements for data acquisition device are given 发了一种基于锁相环的相位测量原理而设计的虚拟相位差测量仪，并给出了该系统对数据采集设备的主要要求。
The movement of the satellites causes doppler frequency to drift , the receiver usually tracks the signal frequency the receiver through phase locked loop , in order to can demodulate the signal 卫星运动造成多普勒频率漂移，接收机一般都采用锁相环来跟踪接收信号频率，以便能正确解调信号。
And the new circuit structure for improving the locking range , that is , injection - locked phase - locked loop circuit ( ilpll ) is introduced into the millimeter wave circuit 在此基础上,结合注入锁定和环路锁相原理,在毫米波频率源中引入了一种新型的展宽带宽的电路结构环路注入锁定锁相电路( ilpll ) 。
The function of phase - locked loop ( pll ) in the algorithm is analyzed theoretically in detail . the method solved the problem of real - time harmonics and reactive detecting successfully and it can be realized easily 在算法的理论研究中，重点分析了锁相环电路相位误差问题，并给出了相应的解决方法。
This paper illuminates theory , structure , spectrum distribution , merits and defects , especially spurs of direct digital synthesis ( dds ) , and it then introduces phase locked loop ( pll ) theory 对dds的结构、优缺点、频谱分布，特别是杂散性能进行了详细的阐述。接着，又介绍了锁相环（ pll ）的原理。
