Key result
A power-efficient arterial pulse waveform sensing system was developed, consuming 10 μW with an input-referred noise of 7.2 μVrms, a gain of 32-40 dB, and a THD of -74.6 dB.
The proposed system offers a power-efficient and highly linear approach for non-invasive arterial pulse waveform acquisition.
This paper presents a power-efficient, highly-linear sensing system for arterial pulse waveform (APW) acquisition. The system consists of a front-end circuit connected to a packaged silicone-coated resistive-bridge pressure sensor for detecting APW through direct skin contact in a non-invasive manner. Compared to other pulse sensing approaches, the proposed front-end only requires an instrumentation amplifier (IA) and a low-pass filtering analog-to-digital converter (LPF-ADC), and consumes a total power of 10 μW. An automatic calibration circuit is proposed to compensate for the resistive-bridge offset and can reduce such offset down to 1 mV. High linearity in the IA is provided through the use of a super class-AB output stage. A LPF-ADC architecture is employed to extract and digitize the APW in a 100 Hz bandwidth, saving 90 % of the passives area. The front-end provides a measured input-referred noise of 7.2 μVrms with a gain of 32-40 dB, and a THD of -74.6 dB. Together with an on-chip low dropout regulator (LDO) and a buffer stage, the prototype fabricated in 0.18 μm CMOS technology has an active area of 0.52 mm 2 .
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Hsu et al. (2019) studied this question. Arterial pulse waveform sensing system vs. Other pulse sensing approaches was evaluated on System performance (power consumption, noise, gain, THD). A power-efficient arterial pulse waveform sensing system was developed, consuming 10 μW with an input-referred noise of 7.2 μVrms, a gain of 32-40 dB, and a THD of -74.6 dB.
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