A 3.2×1.5×0.8mm3 240nA 1.25-to-5.5V 32kHzDTCXO RTC Module with an Overall Accuracy of ±1ppm and an All-Digital 0.1ppm Compensation-Resolution Scheme at 1Hz

📋 论文概要

本文提出了一款超低功耗、小尺寸的32kHz数字温度补偿晶体振荡器（DTCXO）实时时钟（RTC）模块，工作电流仅240nA，供电电压范围1.25-5.5V。通过全数字0.1ppm补偿方案实现了整体±1ppm的计时精度，解决了传统TCXO功耗高、体积大的问题。

💡 主要创新点

• 采用全数字温度补偿架构替代传统模拟补偿，在极低功耗下实现0.1ppm分辨率补偿，从而达成±1ppm整体精度。
• 通过电路与封装协同设计，将模块体积压缩至3.2×1.5×0.8mm³，同时支持1.25V至5.5V宽电压工作。
• 在240nA超低功耗下实现32kHz振荡，适合长期电池供电的便携设备应用。

🏷 关键词

📄 原文摘要

still remains the most popular, cost effective, low power, accurate solution for low-power portable applications. Simple solutions with overall accuracies of a few 100ppm are based on the combination of a through-hole or SMD XTAL together with an oscillator implemented as part of the application SoC (micro-controller, cell phone). As a single-ppm error represents a deviation of 30s/year (nearly 1 hour/year at 100ppm!), temperature-compensated XTAL or MEMS oscillators (TCXO, TCMO) used for time-keeping applications have received significant research attention over the last decade, driven by further miniaturization, tighter accuracy and lower power consumption needs [1-4]. Combining both resonator and oscillator intimately or even better, in a single package, leads to superior stability,

👥 作者与机构

David Ruffieux1, Franz Pengg1, Nicola Scolari1, Frédéric Giroud1,

Daniel Severac1, Thanh Le1, Silvio Dalla Piazza2, Olivier Aubry2 CSEM, Neuchâtel, Switzerland, 2Micro Crystal, Grenchen, Switzerland 1 Timekeeping based on a 32kHz XTAL