This work presents the design of a front-end MEMS piezoresistive pressure sensor readout circuit along with a drug actuator model based on TSMC 0.18 μm CMOS technology. The overall system finds application in implantable systems based on micro-pressure sensing and actuation such as the closed loop automatic micturition chip. The system consists of high performance and ultra-low noise chopper stabilized differential amplifier front-end, a digitally programmable threshold generator and window comparator circuit for setting up the pressure thresholds for urination, and an actuator model that simulates drug delivery for micturition, overactive bladder control, and bladder closure. The system also has a novel core circuit enable for power savings mode. The corresponding sub-circuits have been designed to operate in low power that is suitable for implantation and be powered by energy harvesters.

这项工作提出了前端MEMS压阻式压力传感器读出电路的设计，以及基于TSMC 0.18μmCMOS技术的药物执行器模型。整个系统在基于微压感测和驱动的可植入系统中找到了应用，例如闭环自动排尿芯片。该系统由高性能和超低噪声斩波稳定的差分放大器前端，数字可编程阈值发生器和窗口比较器电路（用于设置排尿的压力阈值）以及用于模拟排尿，膀胱过度活动的药物执行器模型组成控制和膀胱闭合。该系统还具有新颖的核心电路，可实现省电模式。