{"title":"Star-Delta Connection Three-Stage Millimeter Wave Band LC Ring Oscillator","authors":"R. Bostani, J. Hasani, K. El-Sankary","doi":"10.1109/newcas49341.2020.9159815","DOIUrl":null,"url":null,"abstract":"In this paper, a new topology is proposed for a three-stage LC ring oscillator. First, it is shown that the conventional ring oscillator can be represented as a configuration of a star connection of inductors. Next, in the proposed topology, the star connection is replaced with a star-delta connection to increase the inductance value for a given oscillation frequency. This is desirable in millimeter-wave band frequencies, where the inductance value is very small and severely affected by parasitic and may entail limitations in foundry design kits. By using the delta connection of the inductors, a higher oscillation frequency is achieved for a given inductance. Analytic equations are presented to calculate the oscillation condition and frequency of oscillation in the proposed topology. Moreover, the proposed structure has a better phase noise performance at higher frequencies in comparison to conventional topology. The advantages of the proposed topology are examined by simulations using TSMC 0.18 um RF-CMOS technology. Simulations and analysis results show a 38.36% increase of oscillation frequency in the proposed topology compared to the conventional one with the same components and similar conditions.","PeriodicalId":135163,"journal":{"name":"2020 18th IEEE International New Circuits and Systems Conference (NEWCAS)","volume":null,"pages":null},"PeriodicalIF":0.0000,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"2020 18th IEEE International New Circuits and Systems Conference (NEWCAS)","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/newcas49341.2020.9159815","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0
Abstract
In this paper, a new topology is proposed for a three-stage LC ring oscillator. First, it is shown that the conventional ring oscillator can be represented as a configuration of a star connection of inductors. Next, in the proposed topology, the star connection is replaced with a star-delta connection to increase the inductance value for a given oscillation frequency. This is desirable in millimeter-wave band frequencies, where the inductance value is very small and severely affected by parasitic and may entail limitations in foundry design kits. By using the delta connection of the inductors, a higher oscillation frequency is achieved for a given inductance. Analytic equations are presented to calculate the oscillation condition and frequency of oscillation in the proposed topology. Moreover, the proposed structure has a better phase noise performance at higher frequencies in comparison to conventional topology. The advantages of the proposed topology are examined by simulations using TSMC 0.18 um RF-CMOS technology. Simulations and analysis results show a 38.36% increase of oscillation frequency in the proposed topology compared to the conventional one with the same components and similar conditions.
本文提出了一种新的三级LC环形振荡器拓扑结构。首先,证明了传统的环形振荡器可以表示为电感星形连接的结构。接下来,在提出的拓扑结构中,星形连接被星形三角形连接取代,以增加给定振荡频率的电感值。这在毫米波频带频率中是理想的,在毫米波频带中,电感值非常小,并且受到寄生的严重影响,并且可能导致铸造设计套件的限制。通过使用电感的三角连接,对于给定的电感可以获得更高的振荡频率。给出了计算该拓扑结构振荡条件和振荡频率的解析方程。此外,与传统拓扑结构相比,该结构在更高频率下具有更好的相位噪声性能。采用台积电0.18 um RF-CMOS技术进行仿真,验证了所提出拓扑结构的优点。仿真和分析结果表明,在相同元件和相似条件下,该拓扑结构的振荡频率比传统拓扑结构提高了38.36%。