A 32MHz Crystal Oscillator with Fast Start-up Using Synchronized Signal Injection

📋 论文概要

这篇论文提出了一种使用同步信号注入的32MHz晶体振荡器，实现了快速启动，解决了低功耗传感器节点中晶体振荡器启动时间长导致能耗高的问题。

💡 主要创新点

• 提出同步信号注入技术，通过在起振过程中注入与晶体谐振频率同步的信号，大幅缩短启动时间。
• 优化了电路设计，在实现快速启动的同时保持低功耗，适用于BLE等低占空比应用。

🏷 关键词

📄 原文摘要

Dialog Semiconductor, 's-Hertogenbosch, The Netherlands 1 2 Low-power sensor nodes (e.g. Bluetooth Low Energy, BLE) use low duty-cycle transceivers to obtain an overall low power consumption. The system typically spends most of the time in a low-power sleep state and only briefly wakes up to transmit and receive data. Due to the high Q (>100k) of the crystal resonator the start-up time of a typical crystal oscillator is relatively long (≈ 0.5 to 5ms) which causes a substantial amount of energy to be consumed by the crystal oscillator in a transmit/receive event. As the system usually is in an active state when the crystal oscillator ramps up (multiple sub-systems are powered up) not only should the start-up energy of the crystal oscillator be optimized, but also the startup time. As the crystal resonator is one of the most costly components in IoT sensor nodes, a wide range of crystal resonators should be supported by the

👥 作者与机构

Bram Verhoef1, Jan Prummel2, Wim Kruiskamp2, Rein Post2

Dialog Semiconductor, Hengelo, The Netherlands