An implantable readout circuit using a MEMS pressure sensor has been designed and implemented to monitor the heart activity after heart transplant surgery. It features a time domain architecture using two identical voltage-controlled oscillators and phase locked loop circuits. The circuit was implemented in a 65 nm CMOS technology with 1 V power supply. It consumes 100 μW100~\mu \text{W} power and provides a digital output that is proportional to the analog sensor input with a bandwidth of up to 4 kHz. The SNR of the system is 53 dB. Measurements show the operation of the readout chip with the MEMS sensor.

中文翻译：

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用于心脏移植的植入式锁相环 MEMS 读出系统


设计并实现了使用 MEMS 压力传感器的植入式读出电路，用于监测心脏移植手术后的心脏活动。它采用时域架构，使用两个相同的压控振荡器和锁相环电路。该电路采用 65 nm CMOS 技术和 1 V 电源实现。它消耗 100 μW100~\mu \text{W} 功率，并提供与模拟传感器输入成比例的数字输出，带宽高达 4 kHz。系统的信噪比为53 dB。测量结果显示了带有 MEMS 传感器的读出芯片的运行情况。