{"title":"Analysis and Design of a 21.2-to-25.5-GHz Triple-Coil Transformer-Coupled QVCO","authors":"Ya Zhao;Chao Fan;Jun Yin;Pui-In Mak;Li Geng","doi":"10.1109/TCSI.2024.3445179","DOIUrl":null,"url":null,"abstract":"This paper reports a triple-coil transformer-coupled quadrature voltage-controlled oscillator (TC-QVCO), which inherently provides the quadrature signal without using the noisy active-coupling transistors. The determinate correlation of tank voltages is verified by utilizing the initial state to facilitate the oscillation state analysis. Thus, the TC-QVCO would operate without the oscillation mode ambiguity. Additionally, thanks to the triple-coil transformer coupling, a large source coil \n<inline-formula> <tex-math>$L_{S}$ </tex-math></inline-formula>\n aids in achieving in-phase coupling for phase noise (PN) improvement, and the intensified coupling factor \n<inline-formula> <tex-math>$k_{gd}$ </tex-math></inline-formula>\n benefits reducing the PN and the quadrature phase error simultaneously. Therefore, our TC-QVCO would alleviate the tradeoff between PN and quadrature phase accuracy via using a large \n<inline-formula> <tex-math>$L_{S}$ </tex-math></inline-formula>\n and \n<inline-formula> <tex-math>$k_{gd}$ </tex-math></inline-formula>\n. The proposed QVCO prototyped in 65-nm CMOS exhibits a superior FoM\n<inline-formula> <tex-math>$_{\\text {@10MHz}}$ </tex-math></inline-formula>\n (180.1 to 182.2 dBc/Hz) over a 18.2% frequency tuning range (21.2 to 25.5 GHz), and the estimated quadrature phase error <0.8°.","PeriodicalId":13039,"journal":{"name":"IEEE Transactions on Circuits and Systems I: Regular Papers","volume":"71 10","pages":"4538-4549"},"PeriodicalIF":5.2000,"publicationDate":"2024-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"IEEE Transactions on Circuits and Systems I: Regular Papers","FirstCategoryId":"5","ListUrlMain":"https://ieeexplore.ieee.org/document/10643618/","RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, ELECTRICAL & ELECTRONIC","Score":null,"Total":0}
引用次数: 0
Abstract
This paper reports a triple-coil transformer-coupled quadrature voltage-controlled oscillator (TC-QVCO), which inherently provides the quadrature signal without using the noisy active-coupling transistors. The determinate correlation of tank voltages is verified by utilizing the initial state to facilitate the oscillation state analysis. Thus, the TC-QVCO would operate without the oscillation mode ambiguity. Additionally, thanks to the triple-coil transformer coupling, a large source coil
$L_{S}$
aids in achieving in-phase coupling for phase noise (PN) improvement, and the intensified coupling factor
$k_{gd}$
benefits reducing the PN and the quadrature phase error simultaneously. Therefore, our TC-QVCO would alleviate the tradeoff between PN and quadrature phase accuracy via using a large
$L_{S}$
and
$k_{gd}$
. The proposed QVCO prototyped in 65-nm CMOS exhibits a superior FoM
$_{\text {@10MHz}}$
(180.1 to 182.2 dBc/Hz) over a 18.2% frequency tuning range (21.2 to 25.5 GHz), and the estimated quadrature phase error <0.8°.
期刊介绍:
TCAS I publishes regular papers in the field specified by the theory, analysis, design, and practical implementations of circuits, and the application of circuit techniques to systems and to signal processing. Included is the whole spectrum from basic scientific theory to industrial applications. The field of interest covered includes: - Circuits: Analog, Digital and Mixed Signal Circuits and Systems - Nonlinear Circuits and Systems, Integrated Sensors, MEMS and Systems on Chip, Nanoscale Circuits and Systems, Optoelectronic - Circuits and Systems, Power Electronics and Systems - Software for Analog-and-Logic Circuits and Systems - Control aspects of Circuits and Systems.