This paper proposes a new structure of 24-GHz class-C voltage-controlled oscillator (VCO) using an auto-adaptive bias technique. The VCO in this paper uses a digitally controlled circuit to eliminate the possibility of start-up failure that a class-C structure can have and has low phase noise and a wide frequency range. To expand the frequency tuning range, a 3-bit cap-bank is used and a triple-coupled transformer is used as the core inductor. The proposed class-C VCO implements a 65-nm RF CMOS process. It has a phase noise performance of −105 dBc/Hz or less at 1-MHz offset frequency and the output frequency range is from 22.8 GHz to 27.3 GHz, which consumes 8.3–10.6 mW of power. The figure-of-merit with tuning range (FoM_T) of this design reached 191.1 dBc/Hz.

中文翻译：

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使用自适应偏置技术的低相位噪声和大范围C类VCO

本文提出了一种采用自适应偏置技术的24 GHz C类压控振荡器（VCO）的新结构。本文中的VCO使用数字控制电路来消除C类结构可能具有的启动故障，并且具有低相位噪声和宽频率范围。为了扩展频率调谐范围，使用了3位电容组，并使用了三重耦合变压器作为核心电感器。拟议中的C类VCO实现了65纳米RF CMOS工艺。在1MHz偏移频率下，它的相位噪声性能为−105 dBc / Hz或更低，输出频率范围为22.8 GHz至27.3 GHz，功耗为8.3–10.6 mW。该设计的调谐范围的品质因数（FoM _T）达到191.1 dBc / Hz。