A Comparative Study of Switchable Capacitor Structures for LC Oscillators in a 28-nm Technology

Lantao Wang, Jonas Meier, R. Wunderlich, S. Heinen
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引用次数: 1

Abstract

Switchable capacitors (SC) are increasingly intensively used in modern LC oscillators, as they suffer less on the process variation in comparison to the conventional MOSFET-based varactors with the technology shrinking. In the design of an LC oscillator, the structure of the SC is carefully chosen because it serves as the main contributor to the overall quality factor of the LC tank that has a significant impact on the phase noise performance of the oscillator. In order to study the characteristics of recently popular SC structures, this paper introduces a design methodology using large-signal simulations, i.e. periodic steady-state (PSS) and periodic AC analysis (PAC), to better calculate the difference between on- and off-state capacitance as well as the quality factor. The influence of the structures of the SC on the performance of the LC oscillator is verified using a 10 GHz complementary class-B digitally controlled oscillator designed in a 28-nm CMOS technology.
28纳米工艺中LC振荡器可切换电容器结构的比较研究
随着技术的不断缩小,与传统的基于mosfet的变容管相比,可切换电容器(SC)在现代LC振荡器中的应用越来越广泛。在LC振荡器的设计中,SC的结构是精心选择的,因为它是LC槽整体质量因子的主要贡献者,对振荡器的相位噪声性能有重大影响。为了研究最近流行的SC结构的特性,本文介绍了一种采用大信号模拟的设计方法,即周期稳态分析(PSS)和周期交流分析(PAC),以更好地计算开、关状态电容的差异以及质量因子。通过采用28纳米CMOS技术设计的10 GHz互补b类数控振荡器,验证了SC结构对LC振荡器性能的影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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