A 0.01mm2 10MHz RC Frequency Reference with a 1-Point On-Chip-Trimmed Inaccuracy of ±0.28% from -45°C to 125°C in 0.18µm CMOS

📋 论文概要

本文提出一种基于RC振荡器的紧凑型频率参考，采用单点片上修调技术，在-45°C至125°C宽温度范围内实现±0.28%的精度，芯片面积仅0.01mm²。有效解决了传统RC振荡器需要多点修调或大面积温度补偿电路的问题。

💡 主要创新点

• 采用单点片上修调（1-point on-chip trimming）技术，无需多点修调或复杂温度补偿，大幅减小芯片面积。
• 在0.18µm工艺下实现0.01mm²的超小面积，同时保持宽温度范围内的高精度（±0.28%）。

🏷 关键词

📄 原文摘要

Silicon Integrated, Eindhoven, The Netherlands, 3Tsinghua University, Beijing, China *Equally-Credited Authors (ECAs) 1 2 CMOS frequency references based on RC oscillators are usually preferred over bulky crystals in IoT applications [1-5]. However, due to the process spread and finite temperature coefficient (TC) of most on-chip resistors, RC oscillators require trimming and temperature compensation to achieve decent accuracy. Enabled by high-resolution trimming techniques such as ∆Σ [1,2] or pulse-density [3] modulation, recent designs can obtain good accuracy (<0.1%) at the expense of large chip area. However, existing compact (<0.02mm2) designs suffer from frequency errors in the order of 1% or more [4,5]. Moreover, their temperature compensation schemes usually require the use of resistors with complementary TCs, which are not available in all CMOS technologies. This paper describes a compact RC frequency reference with on-chip circuits with which

👥 作者与机构

Xiaomeng An*1,2, Sining Pan*1,3, Hui Jiang2, Kofi A. A. Makinwa1

Delft University of Technology, Delft, The Netherlands