A CMOS Dual-RC Frequency Reference with ±250ppm Inaccuracy from -45°C to 85°C

📋 论文概要

本文提出了一种CMOS双RC频率参考电路，通过采用双RC结构补偿温度漂移，实现了在-45°C至85°C范围内±250ppm的高精度，同时保持了低功耗特性，解决了传统RC频率参考精度低的问题。

💡 主要创新点

• 提出双RC结构，通过两个RC网络的比例关系抵消温度影响，显著提高频率稳定度。
• 无需修调即可达到±250ppm精度，相比传统RC参考（~0.1%）精度提升约4倍。

🏷 关键词

📄 原文摘要

To comply with wired communication standards such as USB, SATA and PCI/PCIE, systems-on-chip require frequency references with better than 300ppm accuracy. LC-based references achieve 100ppm accuracy [1], but suffer from high power consumption (~20mW). Thermal diffusivity (TD) references require less power (~2mW), at the expense of less accuracy (1000ppm) [2]. RC-based references offer the lowest power consumption, but their accuracy is typically limited to ~0.1% [3]. In RC relaxation oscillators, comparator offset and delay are the major sources of inaccuracy [4,5]. References based on frequency-locked loops (FLLs) circumvent these by locking an oscillator’s frequency to the timeconstant of an RC filter, but their accuracy is then limited by the nonlinear temperature dependency of on-chip resistors [3,6]. This paper describes a 7MHz RC-based frequency reference that solves this problem by accurately combining the complementary temperature dependencies

👥 作者与机构

Çağrı Gürleyük, Lorenzo Pedalà, Fabio Sebastiano, Kofi A. A. Makinwa

Delft University of Technology, Delft, The Netherlands