J4 ›› 2012, Vol. 34 ›› Issue (2): 62-66.
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马 卓,郭 阳,谢伦国
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MA Zhuo,GUO Yang,XIE Lunguo
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摘要:
半速率高速串行接口同时使用时钟的正/负边沿作为发送数据的定时基准,数据码元的定时长度直接由时钟的占空比决定,因此锁相环的输出时钟的占空比显得尤为重要。本文基于0.13μm CMOS工艺设计实现了一款1.25GHz的高频锁相环。该锁相环基于环形振荡器结构,使用互补相位调节技术实现输出时钟的占空比平衡。流片测试结果表明,该锁相环能够稳定输出1.25GHz的高频时钟,实测输出时钟的占空比能够稳定在49.86%~52.89%的范围内,平均占空比为51.21%。
关键词: 半速率;高速串行接口;锁相环;占空比平衡;互补相位调节
Abstract:
In highspeed SerDes with the half rate structure, the duty of the clock is seriously important, which is the decisive factor for unit intervals. In this article, a 1.25GHz ring oscillator PLL is established on the 0.13μm CMOS process, in which a duty balance circuit is integrated. The result of testing shows the stable output clock is 1.25GHz, and the duty is within the range of 49.86~51.21%, and the mean duty is 51.21%.
Key words: halfrate;SerDes;PLL;duty balance;coupling phase adjustment
马 卓,郭 阳,谢伦国. 占空比优化的1.25GHz CMOS锁相环[J]. J4, 2012, 34(2): 62-66.
MA Zhuo,GUO Yang,XIE Lunguo. 1.25GHz CMOS PLL With the Duty Optimizing Technique[J]. J4, 2012, 34(2): 62-66.
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链接本文: http://joces.nudt.edu.cn/CN/
http://joces.nudt.edu.cn/CN/Y2012/V34/I2/62