1. 相位检测器(Phase Detector): 相位检测器用于比较输入信号和反馈信号的相位差,并将其转换为控制电压。最常见的相位检测器有两种类型:PFD(Phase Frequency Detector)和CP(Charge Pump)。 2. 环路滤波器(Loop Filter): 环路滤波器用于滤除相位检测器输出的高频噪声,并产生平滑的控制电压信号。它通常使用低通滤波器...
现在一些功能强大的时钟芯片集成的PLL架构大多如下,最重要的部分就是鉴相器(Phase Detector)电荷泵(Charge Pump,用于输出电压控制VCO频率),环路滤波器(Loop Filter),压控振荡器(VCO)以及N Diverder。 也就是下面框图中的那个环。 这里主要挑出一些PLL在实际应用中非常重要的问题来总结一下: 1.鉴相频率Fpd,在...
charge pump的电压为1V,为保证up和dn电流线性度,vctrl电压范围设定为0.2V~0.8V,这样Corner下需要保证振荡器最高振荡频率>2GHz Kvco~=4.1GHz/V 5)电平转换器(level shift) VCO电平转换器,一般有dc和ac两种结构,本文采用dc结构,示意图如下 6)环路分频器(loop divier) 支持4~77连续分频,本文采用 2/3 Prescaler...
A charge pumped phase locked loop circuit (PLL) is disclosed that includes a phase detector for detecting the phase error between a reference clock and an output clock to generate a phase error signal. A charge pump is provided that is controlled by the phase error signal to either source ...
Integrated PLL loop filter and charge pump 专利名称:Integrated PLL loop filter and charge pump 发明人:Konstantinos Manetakis,Nicolas Constantinidis 申请号:US11050131 申请日:20050203 公开号:US07427900B2 公开日:20080923 专利内容由知识产权出版社提供 专利附图:摘要:A charge pumped phase locked loop...
PLL由以下几部分组成:前置分频计数器(D计数器)、相位-频率检测器(PFD,Phase-Frequency Detector)电路,电荷泵(Charge Pump)、环路滤波器(Loop Filter)、压控振荡器(VCO,Voltage Controlled Oscillator)、反馈乘法器计数器(M计数器)和后置分频计数器(O1-O6计数器)。 ...
PLL 由以下几部分组成:前置分频计数器(D 计数器)、相位频率检测器(PFD,Phase-Frequency Detector)电路、电荷泵(Charge Pump)、环路滤波器(Loop Filter)、压控振荡器(VCO,Voltage Controlled Oscillator)、 反馈乘法器计数器(M 计数器)和后置分频计数器(O1-O6 计数器)。
A loop filter’s bandwidth can be doubled by doubling either the PFD frequency or the charge-pump current. If the actual Kv of the VCO is significantly higher than the nominal Kv used to design the loop filter, the loop bandwidth will be significantly wider than expected. The variation of...
in order to attenuate its high frequency content before it feeds into the loop filter opamp. The reason for doing so is that the opamp has limited bandwidth and can exhibit nonlinear behavior if it is directly driven with the high frequencies that are present in the charge pump output. The ...
前置分频计数器(N计数器)、相位-频率检测器(PFD,Phase-Frequency Detector)电路,电荷泵(Charge Pump)、环路滤波器(Loop Filter)、压控振荡器(VCO,Voltage Controlled Oscillator)、反馈乘法器计数器(M计数器)和后置分频计数器(K和V计数器)。 在工作时,PFD检测其参考频率(FREF)和反馈信号(Feedback)之间的相位差和...