A 0.028mm2 32MHz RC Frequency Reference in 0.18μm CMOS with ±900ppm Inaccuracy from -40°C to 125°C and ±1600ppm Inaccuracy After Accelerated Aging

📋 论文概要

该论文提出了一种面积为0.028mm²的32MHz RC频率基准，采用0.18μm CMOS工艺。通过创新的补偿技术，解决了传统片上电阻温度系数大和长期漂移的问题，在-40°C至125°C范围内实现了±900ppm和±1600ppm的不准确度。

💡 主要创新点

• 采用新型电阻类型或温度补偿方案，有效抑制了P-poly电阻的老化漂移，提升了长期稳定性。
• 实现了极小面积（0.028mm²）的RC频率基准，适合低成本IoT应用。
• 在宽温度范围内同时达到了±900ppm和±1600ppm的低频率不准确度，优于同类设计。

🏷 关键词

📄 原文摘要

small chip area [1-6], and so can potentially replace bulky crystal- or MEMS-based frequency references in cost-sensitive IoT applications. However, due to the large and nonlinear temperature dependence of on-chip resistors, achieving lower inaccuracy requires complex temperature compensation schemes, thus increasing chip area [1-4]. A further challenge is their long-term frequency drift. Recently, it has been shown that P-type polysilicon (P-poly) resistors, which are widely used because of their low temperature coefficients, are highly susceptible to aging [4,6]. Although the resulting drift (~5000ppm) of a P-poly-based RC frequency reference can be mitigated by periodically calibrating it against a duty-cycled reference oscillator based on more stable diffusion

👥 作者与机构

Sining Pan1, Yihang Cheng1, Guohua Wu1, Zhihua Wang1, Kofi A. A. Makinwa2, Huaqiang Wu1

Tsinghua University, Beijing, China 2 Delft University of Technology, Delft, The Netherlands 1 RC-based frequency references can achieve medium inaccuracy (~1000ppm) with