A 0.14mm2 16MHz CMOS RC Frequency Reference with a 1-Point Trimmed Inaccuracy of ±400ppm from −45°C to 85°C

📋 论文概要

本文提出了一种16MHz RC频率参考，通过单点室温校准实现了在-45°C至85°C范围内±400ppm的精度，解决了传统RC频率参考需要两点校准且功耗面积大的问题。芯片采用0.14mm²面积，88μA功耗，相比先前工作实现了2倍的功耗和面积改进。

💡 主要创新点

• 采用单点室温校准即可达到宽温范围±400ppm的高精度，避免了传统两点校准的成本和时间开销。
• 通过电路设计优化，在0.14mm²小面积和88μA低功耗下实现16MHz输出，相比同类工作功耗和面积均降低约2倍。

🏷 关键词

📄 原文摘要

Recently, rapid strides have been made in improving the accuracy of RC-based frequency references [1-3]. Inaccuracies better than ±500ppm from -45°C to 85°C have been achieved, but typically at the expense of a costly and time-consuming 2-point trim to compensate for RC spread and temperature dependence. This paper describes a 16MHz RC-based frequency reference that achieves ±400ppm inaccuracy over the industrial temperature range with a single room-temperature (RT) trim. The prototype draws 88μA from a 1.8V supply and occupies 0.14mm2, which represents a 2× improvement in both power and area compared to the state of the art [2]. The proposed frequency reference is built around a frequency-locked loop (FLL), which locks the frequency of a digitally controlled oscillator (DCO) to the temperaturecompensated phase shift of an RC filter. In previous work, a Wien bridge (WB) bandpass RC filter was used, and its temperature dependency was corrected with the help of a

👥 作者与机构

Hui Jiang, Sining Pan, Çağrı Gürleyük, Kofi A. A. Makinwa

Delft University of Technology, Delft, The Netherlands