A 24MHz Crystal Oscillator with Robust Fast Start-Up Using Dithered Injection

📋 论文概要

该论文提出了一种采用抖动注入技术的24MHz晶体振荡器，实现了快速启动，解决了物联网无线节点中晶体振荡器启动时间过长导致能量浪费的问题。通过抖动注入技术，在保持低功耗的同时显著缩短了启动时间。

💡 主要创新点

• 提出了一种基于抖动注入的快速启动技术，通过注入抖动信号加速晶体振荡器的起振过程。
• 实现了在24MHz频率下快速启动，同时保持低功耗，适用于蓝牙低功耗等物联网应用。

🏷 关键词

📄 原文摘要

Wireless nodes in Internet-of-Everything (IoE) applications achieve low power consumption by operating the radio at very low duty cycles. The wireless node spends most of its time in sleep, waking only occasionally to transmit or receive data. For some standards, such as Bluetooth Low Energy (BLE), the data or advertising packet length can be less than the time it takes the crystal oscillator, which is used as the reference clock for the radio’s PLL, to turn on. Figure 5.9.1 shows a simplified power profile for a node with a typical BLE advertising packet length. A significant fraction of energy used for each RX/TX burst is used to turn on the oscillator. For applications where average power is not dominated by sleep power, the crystal oscillator start-up time can be a large contributor to average power consumption. As shown in Fig. 5.9.2, the crystal is modeled by lumped elements where Lm, Rm,

👥 作者与机构

Danielle Griffith1, James Murdock1, Per Torstein Røine2

Texas Instruments, Dallas, TX, 2Texas Instruments, Oslo, Norway