Direct conversion Doppler radar vital sign detection system using power management technique

This article is the first to present a low power consumption direct conversion Doppler radar vital sign detection system using a power management technique to detect biomedical signals. The optimal pulse bias with simultaneous switching noise considered was designed to decrease power consumption of the sensor. A noncontact vital sign detection measurement using the optimal pulse bias was performed on a human subject. Based on experimental results, the presented simple and low power system can accurately detect human cardiopulmonary activity, including respiration and heartbeat. Calculated physiological signal amplitudes based on a spectral analysis validates the detection result from presented work. When compared with the sensor using a power amplifier, the proposed sensor can achieve low power dissipation for biomedical monitoring and green energy applications. © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:2167–2174, 2014