Low Phase-Noise and Wide Tuning-Range CMOS Differential VCO for Frequency ?S Modulator

T. Cao, D. Wisland, T. Lande, F. Moradi
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引用次数: 2

Abstract

In this paper, a novel low phase-noise and wide tuning-range CMOS differential Voltage-Controlled Oscillator (VCO) for a frequency ΔΣ modulator (FDSM) is presented. The VCO which converts an analog input voltage to phase information is based on a differential ring oscillator with modified symmetric load and a positive feedback in the differential delay cells, combined with a new bias circuit. The proposed VCO with two stages operating at a low power supply voltage of 0.6V can achieve low power consumption of 212uW, and wide tuning-range by increasing the operating frequency range by about 22%. The phase noise is -132dBc/Hz at 600KHz offset from the centre frequency of 480MHz. The new VCO has a good linearity reducing harmonic distortion in the ΔΣ modulator. The circuits are designed using a 65nm CMOS process.
低频调制器的低相位噪声和宽调谐范围CMOS差分压控振荡器
本文提出了一种用于频率ΔΣ调制器(FDSM)的新型低相位噪声、宽调谐范围CMOS差分压控振荡器(VCO)。将模拟输入电压转换为相位信息的压控振荡器是基于一个改进对称负载的差分环振荡器和差分延迟单元中的正反馈,并结合一个新的偏置电路。所提出的两级压控振荡器工作在0.6V的低电源电压下,工作频率范围提高约22%,可实现212uW的低功耗和宽调谐范围。相位噪声为-132dBc/Hz,偏离480MHz的中心频率为600KHz。新型压控振荡器具有良好的线性度,降低了ΔΣ调制器中的谐波失真。电路采用65nm CMOS工艺设计。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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