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1、一、选择题(将一个正确选项前的字母填在括号内)1自动增益控制简称(A)AAGC B AFC CAPC2 锁相环路电路的作用是(B)A维持工作频率稳定 B实现无频率误差的频率跟踪C使输出信号幅度保持恒定或仅在很小的范围内变化二、填空题2锁相环路由鉴相器、环路滤波器和压控振荡器组成,它的主要作用是用于实现两个电信号相位同步,即可实现无频率误差的频率跟踪。三、简答题1锁相环路与自动频率控制电路实现稳频功能时,哪种性能优越?为什么?答:锁相环路稳频效果优越。这是由于一般的 AFC 技术存在着固有频率误差问题(因为AFC 是利用误差来减小误差),往往达不到所要求的频率精度,而采用锁相技术进行稳频时,可实
2、现零偏差跟踪。2锁相环路由哪几个部分组成?说明其工作原理,它有哪几种自动调节过程?解:由鉴相器(PD)、环路滤波器(LF)、压控振荡器(VCO)组成原理是:进行频率自动跟踪,使输出信号的频率和输入信号的频率相等。当 VCO 由于某种原因而发生变化时,必然相应地产生相位变化,这种相位变化在PD中与输入信号比较,产生相差,PD输出正比于相差,经 LF 滤除高频分量,取出低频分量,用来控制VCO 的压控元件,使其频率趋于输入信号频率。锁相环路的两种自动调节过程是捕捉和跟踪。四、计算题1锁相环路调频波解调器原理电路如图12.7,试分析其解调过程。图12.7 锁相环路调频解调器原理框图解:设输入调频波为
3、uFM(t)=Uimsinit+Kf=Uimsinot+1(t)1(t)=(i-o)t+Kfi为调频波中心频率,o为VCO 固定频率,当 VCO 的频率锁定在 i上时,有此时 VCO 的输入信号,即解调输出电压uo(t)正比于,故从环路滤波器的输出就可得到调频波解调信号。2锁相环路频率合成器如图12.8所示,分析输出频率和输入频率的关系。若已知 fR=100kHZ,M=10,可变分频器的分频比为N=85-96,试求输出频率的可控范围。解:fi=fR/M因为文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 Z
4、M1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9
5、N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 Z
6、M1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9
7、N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 Z
8、M1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9
9、N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 Z
10、M1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4,所以 fo=HZ=(850960)kHZ3如图 12.9所示为双环频率合成器,由两个锁相环和一个混频滤波电路组成。两个参考频率fr1=1kHZ,fr2=100kHZ。可变分频器的分频比范围分别为 n1=1000011000,n2=7201000,固定分频器的分频比n3=10,求输出频率 fy的频率调节范围和频率间隔。解:环路 I是锁相倍频电路。输出频率fo1=n1fr1fo1经n3固定分频后,输出fo2=fr1fo2经n2固定分频后,输出fo3=fr1设混频器输出端用带通滤波器取出和频信号环路
11、也是锁相倍频电路,所以输出频率fy=n2fo4=n2fr2+fr1=n2fr2+fo2由于 n2fr2调节范围为 72100MHZ,频率间隔 0.1MHZ,fo2=fr1的调节范围 11.1MHZ,频率间隔 100HZ所以,fy总调节范围为 73101.1MHZ,间隔为 100HZ,总频率数为281000个。环路 I的输入参考频率为1kHZ,环路的输入参考频率为101101.53kHZ。文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H
12、6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:
13、CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H
14、6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:
15、CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H
16、6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:
17、CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H
18、6C8 ZM1S7Q7M8H44已知晶体振荡频率为1024kHZ,当要求输出频率范围为40500kHZ,频率间隔为 1kHZ,试确定图 12.10频率合成器中的分频比R及N的值。图12.10 单环锁相频率合成器解:fs=1024kHZ,fo=40500kHZ,fr=1kHZ,故R=N=文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M
19、8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9
20、HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M
21、8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9
22、HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M
23、8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4文档编码:CW2G9N2Y4H9 HD2G9E2H6C8 ZM1S7Q7M8H4
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