{"title":"Start-up robustness against resonator-Qs defects in a 2-GHz FBAR VCO","authors":"K. B. Ostman, M. Valkama","doi":"10.1109/FCS.2012.6243615","DOIUrl":null,"url":null,"abstract":"The root locus (RL) method is used to analyze the start-up robustness of a two-stage dual-resonator high-Q VCO. The VCO includes a parallel LC tank and an above-IC FBAR (f<sub>s</sub> = 2.15 GHz, Q<sub>s</sub> = 515) that is prone to contact defects during above-IC post-processing. Results obtained after careful circuit modeling explain the VCO's start-up on f<sub>1</sub> before transitioning to and settling on the desired frequency f<sub>0</sub>. The RL approach is shown to be effective in obtaining the constraints on resonator Q<sub>s</sub> and revealing VCO failure modes. Only severe fabrication defects (Q<sub>s</sub> <; 100) inhibit proper start-up on f<sub>0</sub>.","PeriodicalId":256670,"journal":{"name":"2012 IEEE International Frequency Control Symposium Proceedings","volume":"48 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2012-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"1","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"2012 IEEE International Frequency Control Symposium Proceedings","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/FCS.2012.6243615","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 1
Abstract
The root locus (RL) method is used to analyze the start-up robustness of a two-stage dual-resonator high-Q VCO. The VCO includes a parallel LC tank and an above-IC FBAR (fs = 2.15 GHz, Qs = 515) that is prone to contact defects during above-IC post-processing. Results obtained after careful circuit modeling explain the VCO's start-up on f1 before transitioning to and settling on the desired frequency f0. The RL approach is shown to be effective in obtaining the constraints on resonator Qs and revealing VCO failure modes. Only severe fabrication defects (Qs <; 100) inhibit proper start-up on f0.
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