Abstract
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 <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$100~\mu \text{W}$ </tex-math></inline-formula> 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.
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