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...
摘要 摘要 环路滤波器(LoopFilter,简称LPF)是锁相环(PLL)的重要组成单元,它在很人程度上决定 了PLL的性能。在PLL频率综合器的设计中,为了获得稳定的VCO凋谐电压,环路滤波器起到了 维持环路稳定性、控制环路带内外噪声、防止VCO调谐电压控制线上电压突变、抑制参考边带杂散 干扰(spurs)等重要作州,是PLL频率综合器...
design oftheLPFbecomethe keyofmany PLL applications. ThewidebandPLL loop filter designed inthisthesisisusedinanASICfordigitai TVtuner.Thechip convertsthe、Ⅳide spectrum ofTV signals toafixedmiddle frequency,about36MHz,ThewldebandPLL loop filterdesigned inthisthetismustbewell applicable in quite wide ...
1 文献标识码 :A 文章编号 :1006 - 0707(2014)02 - 0101 -04Design and Simulation of Passive Loop Filter of Third-order PLLREN Qing- lian,GAO Wen- hua, GUO Ping(C ol l ege of E l ectroni c and Inform ati on E ngi neeri ng, T ai yuan U ni versi ty of S ci ence and T ...
宽带PLL环路滤波器的设计
In general, there are two design rules that should be followed when using an active loop filter implementation. First, the output of the charge pump should always feed directly into a high-Q capacitor (i.e. a capacitor with minimal series resistance) in order to attenuate its high frequency...
5Circuit Note CN-0174, Low Noise, 12 GHz, Microwave Fractional-N Phase-Locked Loop (PLL) Using an Active Loop Filter and RF Prescaler. Analog Devices. 2010. 6Harney, Austin. “Designing High-Performance Phase-Locked Loops with High-Voltage VCO.” Analog Dialogue, 43-12. 2009. 作者 Austin...
对于 VCO,噪声在环路带宽频率以下被抑制,而在环路带宽频率以上则不再受到约束。[原文:For all noise and spurs not coming from the VCO, this transfer functionmultiplies upthe phase noise within the loop bandwidth and then suppresses then the filter attenuation begins to kick in after the loopbandwidth...
The program designs a loop filter and displays key parameters including phase noise, reference spurs, lock time, lock detect performance, and others.ADIsimPLL operates with spreadsheet-like simplicity and interactivity. The full range of design parameters such as loop bandwidth, phase 56、 margin, ...
Achieving optimal design of phase-locked loop (PLL) is a major challenge in WiMax technology in order to improve system behavior against noise and to enhance Quality of Service (QOS). A new loop filter design method for phase locked loop (PLLs) is introduced taking into consideration various ...