一个四通道神经刺激IC设计,具有电荷平衡和多个电流输出模式
IEEE transactions on biomedical circuits and systems
|September 22, 2023
概括
本研究引入了一种具有四种输出模式的新型神经刺激器IC,提高了功率效率和刺激持续时间. 电荷平衡技术通过尽量减少剩余电荷来确保患者的安全.
科学领域:
- 生物医学工程 生物医学工程
- 集成电路设计 集成电路设计
- 神经刺激 神经刺激
背景情况:
- 神经刺激需要精确控制当前输出波形.
- 尽量减少功耗和最大限度地提高刺激脉冲持续时间对于植入式设备至关重要.
- 通过有效的费用管理来确保患者安全至关重要.
研究的目的:
- 设计和实施一个多功能的神经刺激集成电路 (IC),具有多种当前输出模式.
- 为了提高功率效率并使用指数电流衰变延长刺激脉冲持续时间.
- 为了整合一个强大的电荷平衡技术,安全的多模式神经刺激.
主要方法:
- 开发了一个神经刺激IC,可以独立选择阴极和阳极相的指数和方波输出,创建四种刺激模式.
- 集成了一个指数级电流生成电路,以最大限度地降低头间电压并增加脉冲持续时间.
- 实施了电荷平衡技术,以减轻所有操作模式的剩余电荷积累.
主要成果:
- 采用180纳米CMOS工艺制造的四通道刺激器IC实现了91.3%的最大功率效率.
- 最长的刺激时间被延长到以前工作的3倍.
- 在指数输出模式下,剩余电荷被最小化为每周期255 pC,电荷快速移除 (<60 μs) 和稳定的电极电压.
结论:
- 拟议的神经刺激IC在功率效率和刺激持续时间方面提供了增强的性能.
- 集成电荷平衡技术有效地将剩余电荷降到最低,确保患者的安全.
- 这种设计代表了植入神经刺激器的重大进步,需要灵活和安全的操作.
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