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来源:百度知道 编辑:UC知道 时间:2024/07/07 22:26:29
锁相环由三个基本部件组成,即鉴相器,环路滤波器和压控振荡器组成。
鉴相器的作用是产生一个输出电压,此电压的平均量正比与两输入信号的的相位的差。
环路低通滤波器的作用是滤除鉴相器输出电流中的无用分量及其他干扰分量,以达到环路所要求的性能,并保证环路的稳定性。
压控振荡器的作用是产生频率随控制电压变化的振荡电压。
滤波器是在依赖于频率基础之上处理信号的一种电路。一个有源滤波器只能在运算放大器正常工作的范围内起作用。
在电子仪器方面,锁相环在频率合成器和相位计等仪器中起了重要作用.
直接数字频率合成技术是一种新的频率合成方法,是频率合成技术的一次革命,随着电子工程领域的实际需要以及数字集成电路和微电子技术的发展,DDS技术日益显露出它的优越性。
关键词:锁相环 振荡器 环路滤波器 频率合成器

The phase-locked loop is composed by three basic parts,namely the discriminator,the ring circuit filter and the pressure control the oscillator to compose.
The discriminator functin produces an output voltage,this voltage mean direct ratio and two input signals phase diference.
The ring circuit low pass filter function is filters in the discriminator output current the useless component and other disturbance component,achieved the ring cricuit requests the preformance ,and guarantees the ring circuit the stability.
The pressure controls the oscillator the function has the frequency along with the control voltage change oscillating voltage.
The filter are in rely on process the signal above the frequency foundation one kind of electric circuit 0.1 active filter only to bo able to have an effect in the operational amlifier normal work scope.
In the electronic instrumentation aspect,the phase-locked loop in instruments and so on in frequency synthesizer and pha