Photoplethysmogram(PPG) and Phonocardiogram(PCG) integrated circuits for multi-mode health monitoring system on the chest

This paper presents PPG and PCG integrated circuits for multi-mode health monitoring system on the chest. Using chopper-stabilization technique and improved noise shaping loop, the noise of the core amplifier in the integrator and the quantization error are reduced in PPG ROIC. The PPG ROIC has a 116.9dB DR and achieves a maximum 92.7dB SNR. Also, Dual peak detector to distinguish PCG S1, S2 peak is introduced. The prototype is fabricated with 0.18 μm BCD process and multi-mode health monitoring system, can be operated as digital-stethoscope, heart-rate monitor, and VTT based BP monitor, implemented in MATLAB program.