基于尾电容的LC-DCO高分辨率调谐方案

Zisong Wang, Lin He, Lu Yang, F. Lin
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引用次数: 1

摘要

提出了一种基于脱敏尾电容调谐的LC数字控制振荡器(DCO)的高分辨率调谐方案。定量分析了振荡频率对尾电容的敏感性。定性地讨论了尾电容对相位噪声的影响。分析和仿真结果表明,合理设计尾电容值可以同时提高相位噪声和分辨率。最后对采用65纳米CMOS技术设计的2.4 GHz DCO进行了仿真验证。调谐分辨率可提高20倍,1 MHz偏移处的相位噪声可提高2 dB。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A high-resolution tail-capacitor based tuning scheme for LC-DCO
This paper presents a high resolution tuning scheme for the LC digitally-controlled-oscillator (DCO) based on desensitized tail capacitance tuning. The sensitivity of the oscillation frequency to the tail capacitance is quantitatively analyzed. The impact of the tail capacitance on the phase noise is qualitatively discussed. Our analysis and simulation results show that both the phase noise and the resolution can be improved simultaneously if the tail capacitance value is properly designed. A 2.4 GHz DCO designed in 65-nm CMOS technology is simulated for demonstration. The tuning resolution can be improved by a factor of 20, and the phase noise at 1 MHz offset can be improved by 2 dB.
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