一个基于VCO的直流传感2级连续时间西格玛-三角形调制器,用于生物传感器读取应用
IEEE transactions on biomedical circuits and systems
|October 9, 2023
概括
本研究引入了一种基于二次电压控制振荡器 (VCO) 的连续时间西格玛-三角调制器 (CTSDM) 的新型电流传感器,以实现高效的电流传感. 这种先进的设计简化了电路,并提高了物联网应用程序的性能.
科学领域:
- 电气工程 电气工程
- 集成电路设计 集成电路设计
- 传感器技术 传感器技术
背景情况:
- 电流传感读出电路通常需要复杂的跨阻抗放大器.
- 传统的SIGMA-DELTA调制器可能会受到高频段量子化噪声的影响.
- 对物联网 (IoT) 应用程序来说,扩展和功率效率至关重要.
研究的目的:
- 提出一种基于二次电压控制振荡器 (VCO) 的新型连续时间西格玛-三角调制器 (CTSDM).
- 为了实现当前信号的直接量化,消除了对额外的跨阻抗放大器的需求.
- 为了实现当前传感读出应用的高性能和低功耗.
主要方法:
- 使用比例积分 (PI) 结构和 VCO 阶段集成器实现二级噪声塑造能力.
- 在当前信号减去的反路径中使用电流转向的数字对模拟转换器.
- 设计一个适合缩小规模的架构,适合小型化.
主要成果:
- 在10kHz的带宽下达到74.6dB的测量信号噪声和扭曲比 (SNDR).
- 在1.2V供电电压下,证明的超低功耗为44.8μW.
- 获得了160.76dB的价值图 (FoM),表明高效率.
结论:
- 拟议的基于VCO的CTSDM提供了一种简化和高效的解决方案,用于电流传感读出.
- 该设计非常适合电源敏感的物联网应用,因为其低功耗和高性能.
- 该架构的可扩展性和稳定性确保其可用于先进的集成系统.
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