基于FLL的节能和温度稳定的数字唤醒计时器,具有时间域温度补偿
Minyoung Song1, Ming Ding2, Yao-Hong Liu2
1Department of Electrical Engineering and Computer Science, Daegu Gyeongbuk Institute of Science and Technology (DGIST), Daegu, South Korea.
概括
本研究引入了基于数字频率锁定循环 (DFLL) 的唤醒计时器,该计时器使用温度补偿来保持稳定的工作频率. 这项创新确保了低功率应用在不同温度下精确的定时.
科学领域:
- 集成电路 集成电路
- 低功率电子产品 低功率电子产品
- 嵌入式系统 嵌入式系统
背景情况:
- 精确的定时对于低功耗嵌入式系统至关重要,但温度变化可以显著影响振荡器和定时器频率.
- 现有的温度补偿技术往往会引入相当大的功率和硬件开销.
- 数字密集频率锁定循环 (DFLL) 为计时应用提供了一个灵活的平台.
研究的目的:
- 开发基于芯片上的数字密集频率锁定循环 (DFLL) 唤醒计时器,具有有效的时间域温度补偿.
- 为了在广泛的温度范围内以最小的功率和硬件开销实现精确的频率稳定性.
- 证明使用互补电阻的新型温度补偿策略的可行性.
主要方法:
- 实现了基于DFLL的唤醒定时器,包含嵌入式温度传感器.
- 利用互补电阻的决定性温度特性进行频率稳定.
- 调节了互补电阻的激活时间窗口,以弥补温度引起的频率偏移.
- 在40纳米CMOS技术中制造了芯片.
主要成果:
- 达到±1ppm的精细修剪步骤,导致修剪后频率误差低于±20ppm.
- 在-40°C至80°C的温度范围内,已证明温度稳定性为8ppm/oC.
- 实现了0.9 pJ/周期的高能效.
- 通过重复使用DFLL结构进行温度传感,展示了微不足道的功率 (2%) 和硬件开销 (<1%).
结论:
- 提出的基于DFLL的唤醒计时器与时域温度补偿有效地稳定了温度变化中的操作频率.
- 这种方法为嵌入式系统中精确计时提供了低开支,节能的解决方案.
- 利用互补电阻特征的技术为背景温度传感和补偿提供了一种可行的方法.
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