5.9 A 24MHz crystal oscillator with robust fast start-up using dithered injection
5.9 A 24MHz crystal oscillator with robust fast start-up using dithered injection
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5.9 使用抖动注入实现稳健快速启动的 24MHz 晶体振荡器
DOI：
10.1109/isscc.2016.7417928
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
P. T. Røine
中科院分区：
文献类型：
--
作者：
D. Griffith;J. Murdock;P. T. Røine
万物互联 (IoE) 应用中的无线节点通过以极低的占空比运行无线电来实现低功耗。无线节点大部分时间都处于睡眠状态，仅偶尔醒来以传输或接收数据。对于某些标准，例如蓝牙低功耗 (BLE)，数据或广告数据包长度可能小于晶体振荡器（用作无线电 PLL 的参考时钟）打开所需的时间。图 5.9.1 显示了具有典型 BLE 广告数据包长度的节点的简化功耗曲线。每个 RX/TX 突发所用能量的很大一部分用于打开振荡器。对于平均功率不受睡眠功率支配的应用，晶体振荡器启动时间可能是平均功耗的一个重要因素。
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.