A low-power and low-phase-noise LC digitally controlled oscillator featuring a novel capacitor bank

A monolithic low-power and low-phase-noise digitally controlled oscillator （DCO） based on a symmetric spiral inductor with center-tap and novel capacitor bank was implemented in a 0.18 μm CMOS process with six metal layers. A third new way to change capacitance is proposed and implemented in this wo...

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Bibliographic Details
Published in:Journal of semiconductors 2010-12, Vol.31 (12), p.105-108
Main Authors: Tian, Huanhuan (欢欢 田), Li, Zhiqiang (志强 李), Chen, Pufeng (普峰 陈), Wu, Rufei (茹菲 吴), Zhang, Haiying (海英 张)
Format: Article
Language:English
Subjects:
LC
低功率
低相位噪声
器具
数字控制振荡器
数控
电容器组
电源供电
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Summary:A monolithic low-power and low-phase-noise digitally controlled oscillator （DCO） based on a symmetric spiral inductor with center-tap and novel capacitor bank was implemented in a 0.18 μm CMOS process with six metal layers. A third new way to change capacitance is proposed and implemented in this work. Results show that the phase noise at I MHz offset frequency is below -122.5 dBc/Hz while drawing a current of only 4.8 mA from a 1.8 V supply. Also, the DCO can work at low supply voltage conditions with a 1.6 V power supply and 4.1 mA supply current for the DCO＇s core circuit, achieving a phase-noise of-121.5 dBc/Hz at offset of 1 MHz. It demonstrates that the supply pushing of DCO is less than 10 MHz/V.
ISSN:1674-4926
DOI:10.1088/1674-4926/31/12/125003