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一个6.7μW低噪音,紧的PLL与输入MEMS基参考振荡器,具有高分辨率的无死/盲区的PFD.
Ahmed Kira1, Mohannad Y Elsayed2, Karim Allidina2
1Department of Electrical and Computer Engineering, McGill University, Montreal, QC H3A 0G4, Canada.
Sensors (Basel, Switzerland)
|January 8, 2025
概括
本研究介绍了用于MEMS计时应用的超低功耗相锁循环 (PLL). 这种新的设计实现了高分辨率和低噪声,使其成为先进频率参考振荡器的理想选择.
科学领域:
- 电气工程 电气工程
- 微电机系统 (MEMS) 是指微电机系统.
背景情况:
- 对于计时和频率参考,MEMS振荡器至关重要.
- 传统的相频探测器 (PFD) 存在死亡/盲区,限制了低噪声性能.
- 对于便携式和集成系统来说,超低功率的操作是必不可少的.
研究的目的:
- 开发一个超低功率的相锁循环 (PLL) 用于MEMS定时/频率参考振荡器应用.
- 设计一个无死/盲区的相频探测器 (PFD),以提高低噪声性能.
- 为了展示与MEMS振荡器集成的高分辨率和高功率的PLL.
主要方法:
- 一个110.2 MHz的PLL被设计使用一个6.89 MHz的MEMS振荡器作为输入.
- 实现了一个超低功耗,高分辨率的PFD,没有重置反路径.
- 该PLL是使用TSMC 65nm CMOS工艺制造的.
主要成果:
- 该PFD实现了100 ps的线性分辨率,误差为<±1.6%,运行到2.5 GHz.
- 该系统的相位噪声在1kHz时为-106.21dBc/Hz,在1MHz偏移时为-135.36dBc/Hz.
- 在1V供应下,PLL消耗了6.709μW,其频率正常化功耗为0.106pW/Hz.
结论:
- 拟议的无死/盲区的PFD可以为MEMS定时参考提供卓越的低噪声特性.
- 与MEMS振荡器集成的超低功率PLL为高级频率参考应用提供了有前途的解决方案.
- 该设计在功耗,分辨率和相位噪声方面实现了出色的性能指标.
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