Analysis and Design of a 21.2-to-25.5-GHz Triple-Coil Transformer-Coupled QVCO

IF 5.2 1区 工程技术 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC
Ya Zhao;Chao Fan;Jun Yin;Pui-In Mak;Li Geng
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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°.
21.2 至 25.5 千兆赫三线圈变压器耦合 QVCO 的分析与设计
本文报告了一种三线圈变压器耦合正交压控振荡器(TC-QVCO),它无需使用噪声有源耦合晶体管即可提供正交信号。利用初始状态验证了槽电压的确定相关性,以方便振荡状态分析。因此,TC-QVCO 在运行时不会出现振荡模式模糊的问题。此外,由于采用了三线圈变压器耦合,大源线圈 $L_{S}$ 有助于实现同相耦合以改善相位噪声 (PN),而增强的耦合系数 $k_{gd}$ 则有利于同时降低 PN 和正交相位误差。因此,我们的 TC-QVCO 将通过使用较大的 $L_{S}$ 和 $k_{gd}$ 来减轻 PN 和正交相位精度之间的权衡。拟议的 QVCO 原型采用 65-nm CMOS 制成,在 18.2% 的频率调整范围内(21.2 至 25.5 GHz)显示出卓越的 FoM $_{text {@10MHz}}$ (180.1 至 182.2 dBc/Hz),估计正交相位误差小于 0.8°。
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来源期刊
IEEE Transactions on Circuits and Systems I: Regular Papers
IEEE Transactions on Circuits and Systems I: Regular Papers 工程技术-工程:电子与电气
CiteScore
9.80
自引率
11.80%
发文量
441
审稿时长
2 months
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.
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