【经验】修改门限滤除输入切换的相位突变解决消抖时钟发生器Si5346失锁
Si5346是SILICON LABS公司的一款基于第四代DSPLL专利技术的消抖时钟发生器产品,RMS jitter为65fs,满足目前传输设备、无线基站设备等通信业务的指标需求,在骨干网、5G回传网、工业以太网等行业中有大量的应用,可以用作时钟源、时钟消抖、网络同步等功能,是这些设备时钟树的核心器件。
因为使用较多,加上用户使用的环境千差万别,常会遇到一些问题,日前笔者就碰到一起使用Si5346时出现的较为奇怪的失锁问题:输入时钟因为存在切换后的相位突变间隔,导致失锁,但是这种失锁问题现象很特别,根据用户提供的状态寄存器数据来看,偶尔的失锁现象存在时,0X000D、0X000E、0X000F的值分别是0X0、0X33、0X03,而0X00FE的寄存器是0XF。说明这时Si5346工作输入是正常的,但是存在LOL和进入了hold模式,很奇怪的是这时没有检测到LOS和OOF告警,与理论分析完全不一致,一般只有出现LOL或者OOF时才会将DSPLL拉入到HOLD模式。进一步根据客户的使用信息反馈,输入端产生相位突变的原因是瞬间切换,时间极短,但用户反馈这切换是必须的,因此必须想办法把它滤除掉。如此来看,只能是想办法不让LOL产生,那样就不会导致主机端的误判。滤除的模式可以通过环路带宽,但是实际上因为不同的相位间隔差值不一致,可能效果不佳,那么还可以采用另外一种方法,即想办法避开这一段,让DSPLL一直处于锁定状态,可以通过CBPro调整LOL门限的方式实现,如下图1。
图1 LOL门限设定界面
LOL的默认状态是DSPLL会根据没有输入切换时进行优化配置,这时是全部自动选择Auto Set方式,由DSPLL自行设计进入LOL和消除LOL的门限,这个值一般都很低,是为了同时优化锁定时间和保持性能,对于上面这种情况,则可以改成手动设置模式,即将DSPLLA、DSPLLB的LOL进入和消除的门限值加大,尝试着避开切换瞬间的相位和频率突变,使得输出一直跟踪输入变化,不用进入失锁模式,也就不会进入hold模式,将这个瞬间切换的影响滤除掉。
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Silicon Labs推出的Si5347、Si5346是一款集成了DSPLL的高性能抖动衰减时钟倍频器,本文详解了有关于DCO数控振荡器的增益和输出频率的计算,在信号处理,数字通信领域,调制解调,变频调速,制导控制,电力电子等领域都有广泛地应用。
Silicon Labs(芯科科技) AN922 对于Si5346/ 47频率使用命令行界面(CLI) 应用笔记
描述- 本资料介绍了如何使用Si5346/47多PLL时钟器件的命令行接口(CLI)进行动态频率调整。内容包括使用ClockBuilder Pro软件生成注册写入以改变频率的步骤,以及如何通过批处理文件调用CLI工具来更改Si5346和Si5347设备的频率。资料还提供了工作流程示例,包括创建基础项目文件、频率编辑文件和批处理文件,以及如何使用这些文件来生成注册设置更改文件,从而在运行时更改输出频率。
型号- SI5345A-B-GM,SI5340A-D-GMR,SI5341A-D-GMR,SI5347D-B-GM,SI5344C-B-GM,SI5341B-B04918-GMR,SI5347A-D-GM,SI5345D-B03700-GM,SI5345B-B04564-GM,SI5345D-D-GM,SI5346A-D-GMR,SI5348A-B-GMR,SI5347A-D-GMR,SI5380,SI5345D-B04831-GM,SI5346A-B-GMR,SI5344D-B-GM,SI5342D-B05470-GM,SI5341C-B-GM,SI5345A,SI5345B,SI5345C,SI5345B-B05955-GM,SI5345D,SI5342D-D-GM,SI5341B-B04187-GMR,SI5341A-B-GM,SI5347D-B-GMR,SI5380-A-ZXM,SI5345D-B04501-GM,SI534XH,SI5356B-B00322-GMR,SI5341D-B-GM,SI5341A-B-GMR,SI5345D-B04409-GM,SI5347C-B-GM,SI5344A-B-GM,SI5341D-D-GMR,SI5340C-B-GMR,SI5342C-D-GM,SI5345B-B00021-GM,SI5345B-B06003-GM,SI5346B,SI5341B-B05197-GMR,SI5347B-D-GM,SI5344B-D-GM,SI5345C-D-GM,SI5347D-D-GMR,SI5345B-B-GMR,SI5346A,SI5346B-B-GMR,SI5345D-B04493-GM,SI5345D-B04502-GM,SI5347A-B-GM,SI5341B-B05496-GM,SI5345D-B05784-GM,SI5341B-D-GM,SI5340B-B-GM,SI5340D-B-GMR,SI5341C-D-GM,SI538X,SI5345A-D-GM,SI5340C-D-GMR,SI5345B-B04421-GM,SI5348B-B05017-GM,SI5347C-D-GMR,SI5346B-B-GM,SI5342D-B-GM,SI5380-D-EVB,SI5342H-C04990-GMR,SI5344H,SI5345C-B-GM,SI5344D,SI5345B-B05825-GM,SI5342B-D-GM,SI5342D-B04694-GM,SI5344D-D-GM,SI5345A-B04957-GM,SI5344A-D-GM,SI5347C-D-GM,SI5345D-B04830-GM,SI5347A-A-GMR,SI5344B-A-GMR,SI5347B-D-GMR,SI5342D-B03814-GM,SI5345B-B03718-GM,SI5344A,SI5344B,SI5340C-D-GM,SI5345B-B03234-GM,SI5344C,SI5347B-B-GM,SI5347C-B-GMR,SI5340D-D-GMR,SI5341B-B-GM,SI5340A-D-GM,SI5341A,SI5341B,SI5341C,SI5341D,SI5345D-B04500-GM,SI5344B-B04184-GM,SI5341B-B05609-GMR,SI5340B-B-GMR,SI5341B-B-GMR,SI5341B-B04226-GMR,SI5345C-A-GM,SI5340D-B-GM,SI5345B-B-GM,SI5344D-B-GMR,SI5345B-B04881-GM,SI5346B-D-GM,SI5340B-D-GM,SI5345A-B-GMR,SI5342A-B-GM,SI5345B-B05785-GM,SI5345D-B05731-GM,SI5340B-D-GMR,SI5342H,SI5345A-A-GM,SI5345B-B05747-GM,SI5342B,SI5348B-B05856-GM,SI5342C,SI5342D,SI5342H-C04990-GM,SI5342B-B-GM,SI5347B-B-GMR,SI5348B-B05083-GM,SI5346B-D-GMR,SI5345B-B04823-GM,SI5345B-B05971-GM,SI5340C-B-GM,SI5348B-B05423-GM,SI5342A,SI5346A-D-GM,SI5340A-B-GM,SI5345D-B-GM,SI5346B-A-GMR,SI5348A-A-GM,SI5341B-B04964-GMR,SI5340D-D-GM,SI5342C-A-GMR,SI5345B-D-GM,SI5342A-D-GM,SI5347C,SI5341C-D-GMR,SI5347D,SI534X,SI5341B-A04048-GMR,SI5345A-B04313-GM,SI5341D-B-GMR,SI5345B-B04408-GM,SI5347D-D-GM,SI5347A,SI5347B,SI5340D,SI5345D-B04494-GM,SI5345D-B04528-GM,SI5341A-D-GM,SI5347A-B-GMR,SI5340A,SI5340B,SI5340C,SI5341D-D-GM,SI5348A-D-GM,SI5345D-B04834-GM,SI5345B-B04563-GM,SI5341B-D-GMR,SI5345A-B04313-GMR,SI5340A-B-GMR,SI5345D-B05729-GM,SI5345D-B04410-GM,SI5341C-B-GMR,SI5345A-A-GMR,SI5342H-D04990-GMR,SI5348A,SI5345B-B05786-GM,SI5346A-B-GM
【经验】如何利用时钟发生器free run模式规避通信系统输入频偏过大
Silicon Labs SI534X时钟发生器使用时往往运行于free run模式,可以规避这种系统上电输入不稳定(频偏过大)的现象。
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