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电子学报  2014 

12.5Gb/s0.18μmCMOS时钟与数据恢复电路设计

DOI: 10.3969/j.issn.0372-2112.2014.08.027, PP. 1630-1635

Keywords: 串行器/解串器(SerDes),时钟数据恢复电路(CDR),鉴频鉴相器(PFD),压控振荡器(VCO)

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Abstract:

采用0.18μmCMOS工艺设计实现了一个12.5Gb/s半速率时钟数据恢复电路(CDR)以及1:2分接器,该CDR及分接器是串行器/解串器(SerDes)接收机中的关键模块,为接收机系统提供6.25GHz的时钟及经二分接后速率降半的6.25Gb/s数据.该电路包括Bang-bang型鉴频鉴相器(PFD)、四级环形压控振荡器(VCO)、V/I转换器、低通滤波器(LPF)、1:2分接器等模块,其中PFD采用一种新型半速率的数据采样时钟型结构,能提高工作速率达到12.5Gb/s.芯片测试结果显示,在1.8V的工作电压下,VCO中心频率在6.25GHz时,调谐范围约为1GHz;输入12Gb/s、长度为231-1的伪随机数据时,得到6GHz时钟的峰峰抖动为9.12ps,均方根(RMS)抖动为1.9ps;整个系统工作性能良好,二分接器输出数据眼图清晰,电路核心模块功耗为150mW,整体芯片面积0.476·0.538mm2.

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