一个高精度的RC时间常数自动调节方案,用于集成的连续时间过器
Micromachines
|January 26, 2024
概括
本研究引入了芯片自动调节方案,以精确控制集成电路中的电阻-电容器 (RC) 时间常数,克服过程变化,以获得可靠的模拟电路性能.
科学领域:
- 电气工程 电气工程
- 模拟集成电路设计模拟集成电路设计
- 半导体设备物理 半导体设备物理
背景情况:
- 由于过程和温度波动,CMOS技术中的电阻电容器 (RC) 时间常数变化对连续时间模拟电路构成重大可靠性挑战.
- 绝对RC时间常数值可以偏离超过±50%,影响电路性能,并需要强大的补偿策略.
研究的目的:
- 提出和验证一种新的芯片自动调节方案,用于在集成电路中准确控制电阻-电容器 (RC) 时常数.
- 通过减轻过程,电压和温度 (PVT) 的变化来提高连续时间模拟波器的可靠性和精度.
主要方法:
- 实现一个离散的主-奴隶自动调节概念,用于RC时间常数调节.
- 寄生电容取消的整合,以消除不必要的寄生效应.
- 应用对称比较来最大限度地减少对比器DC偏移的影响.
- 使用连续的近似程序来加速调整过程.
主要成果:
- 在55nmCMOS技术中使用第四级主动RC低通波器进行验证,显示了调制精度的显著提高.
- 拟议方案在PVT变化和输入偏移电压下实现了2.21%的平均调整误差和3.67%的最大误差.
- 与传统的自动调方案相比,实现的调误差要低得多.
结论:
- 开发的芯片自动调节方案有效地解决了集成电路中RC时间常数变化的长期挑战.
- 提出的技术,包括寄生电容取消和对称比较,导致更高的调整精度和更好的电路可靠性.
- 这项工作为精确的模拟电路设计提供了强大的解决方案,特别是用于在各种环境和工艺条件下运行的连续时间过器.
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