The comparative studies of realizing quadrature voltage-controlled oscillator (QVCO) with MOS transistors and capacitors are presented in this paper. The supply voltage, power consumption, chip area, phase accuracy, phase noise, starting time and frequency tuning range of the two kinds of QVCOs are compared. The two kinds of QVCOs are simulated with GlobalFoundries’ 0.18 μm CMOS RF process, and the Cadence IC Design Tools post-layout simulation results demonstrate that the MOS transistors-coupled QVCO has a low supply voltage, low power consumption and improved phase accuracy; the capacitors-coupled QVCO has low phase noise and short starting time; the chip area and other parameters of the two kinds of QVCOs are the same. The two kinds of QVCOs satisfy the average requirements of modern RF transceivers, so the MOS transistors-coupled QVCO is suitable for low-voltage, low-power-consumption and strict accurate phase requirement transceivers.

中文翻译：

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晶体管和电容器耦合QVCO的比较研究

本文介绍了用MOS晶体管和电容器实现正交压控振荡器（QVCO）的比较研究。比较了两种QVCO的电源电压，功耗，芯片面积，相位精度，相位噪声，启动时间和频率调谐范围。两种QVCO均采用GlobalFoundries的0.18μmCMOS RF工艺进行了仿真，而Cadence IC设计工具的布局后仿真结果表明，耦合MOS晶体管的QVCO具有低电源电压，低功耗和改善的相位精度。电容器耦合的QVCO具有低相位噪声和短启动时间。两种QVCO的芯片面积和其他参数相同。两种QVCO满足现代RF收发器的平均要求，