A 28GHz Low-Phase-Noise CMOS VCO Using an Amplitude-Redistribution Technique

📋 论文概要

本文提出一种振幅再分布技术，通过控制振荡器节点的电压摆幅分布来改善毫米波交叉耦合VCO的相位噪声性能。采用0.13μm CMOS工艺实现的28GHz VCO展示了-112.9dBc/Hz @ 1MHz偏移的低相位噪声。

💡 主要创新点

• 提出振幅再分布技术，通过调节振荡器节点电压摆幅的分布来优化相位噪声，而不增加功耗或面积。
• 在28GHz频率下实现了优于传统结构的低相位噪声性能，验证了该技术在毫米波频段的有效性。

🏷 关键词

📄 原文摘要

Increasing demands for multi-Gb/s data transmission make the mm-wave wireless communication systems more attractive. The VCO is an essential block in these systems. This paper describes an amplitude-redistribution technique which improves phase noise performance of mm-wave cross-coupled VCOs by controlling the distribution of voltage swings on the oscillator nodes. A 28GHz VCO, fabricated in a 0.13μm CMOS process, uses this technique and demonstrates low phase-noise performance of −112.9dBc/Hz at 1MHz offset. According to the well-known Leeson’s model [1], a high Q-factor, high output power and low noise factor lead to a low oscillator phase noise. On the other hand, Hajimiri pointed out that low harmonic distortion of oscillation waveform is important for low phase noise from a viewpoint of time-variant systems [2]. In a fineline CMOS LC-VCO operating at mm-wave frequencies often the tail current source is removed to improve the phase noise performance, by which high output power and

👥 作者与机构

Yusuke Wachi, Toshiyuki Nagasaku, Hiroshi Kondoh

Hitachi, Tokyo, Japan