A 90µW 12MHz Relaxation Oscillator with a –162dB FOM

📋 论文概要

本文提出一种90µW、12MHz的松弛振荡器，实现了-162dB的优值(FOM)。通过优化电流源和比较器设计，解决了传统松弛振荡器功耗高、相位噪声差的问题。

💡 主要创新点

• 采用低功耗比较器和电流源架构，实现亚微瓦级功耗下的稳定振荡。
• 通过噪声优化技术，达到-162dB的FOM，显著优于传统松弛振荡器。

🏷 关键词

📄 原文摘要

Gerard J. M. Wienk, Bram Nauta University of Twente, Enschede, Netherlands Both ring oscillators and relaxation oscillators are subsets of RC oscillators featuring large tuning ranges and small areas. Figure 19.5.1 shows a typical relaxation oscillator with a capacitor and two switched current sources. Such relaxation oscillators have two advantages with respect to ring oscillators: 1) they have a constant frequency tuning gain; and 2) their phase can be read out continuously due to their triangular (or sawtooth) waveform. A major disadvantage of practical relaxation oscillators is their poor phase-noise compared to ring oscillators [1,2,4]. The 1/f2 phase-noise performance of oscillators can be compared using the FoM definition given in Fig. 19.5.3 [1]. Navid et al. have shown that at 290K thermodynamics limits the FoM of ring oscillators and relaxation oscillators to -165.3dB and -169.1dB,

👥 作者与机构

Paul F. J. Geraedts, Ed van Tuijl, Eric A. M. Klumperink,