华中科技大学学报（自然科学版）2016，Vol.44Issue(5)：76-80,5.DOI:10.13245/j.hust.160514
基于最小变电容结构的数控 LC 振荡器
All-digital controlled LC oscillator based on minimum variable capacitor
摘要
Abstract
An digital controlled minimum variable capacitor structure was proposed .With four same capacitors across the complementary varactor pairs ,smaller minimum capacitance value could be a‐chieved by using larger size varactor to reduce the influence of the fabrication error ,solve the nonlin‐ear problems under large signal swing oscillation ,and relax the restriction of the mismatch capacitor capacitance on the minimum capacitance value .In the same process ,the minimum capacitance value was reduced by nearly 50% .An all‐digital controlled LC (inductance capacitance) oscillator was de‐signed by using the proposed minimum variable capacitor structure .The frequency resolution of the designed oscillator was improved by changing the different digital controlled capacitor array according‐ly .The proposed oscillator was implemented by a 180 nm complementary metal oxide semiconductor (CMOS) process .The simulation results show that the proposed structure can obtain a minimum ca‐pacitance value of 7 .42 aF ,a frequency range of 3 .2 to 3 .8 GHz ,an output voltage swing of 1 .75 V , a phase noise of -1 .2 × 10-4 dBc/Hz at the 3 .5 GHz signal and a 1 M Hz offset ,and a FOM (figure of merit) of 211 .The design can improve the accuracy of frequency modulation apparently while keep the FOM value ,phase noise and power consumption at the same level .关键词
最小变电容/数控振荡器/调频精度/LC振荡器/全数控Key words
minimum variable capacitor/digital controlled oscillator/frequency modulation accuracy/LC oscillator/all-digital control分类
信息技术与安全科学引用本文复制引用
吴朝晖,王银强,李斌..基于最小变电容结构的数控 LC 振荡器[J].华中科技大学学报（自然科学版）,2016,44(5):76-80,5.基金项目
国家自然科学基金资助项目（61571196）；广东省自然科学基金资助项目（2014A030310372）． （）
