Noncontact Proximity Vital Sign Sensor Based on PLL for Sensitivity Enhancement

• Published in: IEEE transactions on biomedical circuits and systems Vol. 8; no. 4; pp. 584 - 593
• Main Authors: Hong, Yunseog, Kim, Sang-Gyu, Kim, Byung-Hyun, Ha, Sung-Jae, Lee, Hee-Jo, Yun, Gi-Ho, Yook, Jong-Gwan
• Format: Journal Article
• Language: English
• Published: United States IEEE 01.08.2014; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Ambient temperature; Biomedicine; Breath Tests - instrumentation; Equipment Design; feedback circuit; Heart Rate - physiology; Humans; Impedance; input impedance variation; near-field receiving antenna; noncontact; phase locked loop (PLL); Phase locked loops; remote sensing; Resonant frequency; Respiration; Sensitivity; Signal Processing, Computer-Assisted; Temperature sensors; vital sign sensor; Voltage-controlled oscillators

In this paper, a noncontact proximity vital sign sensor, using a phase locked loop (PLL) incorporated with voltage controlled oscillator (VCO) built-in planar type circular resonator, is proposed to enhance sensitivity in severe environments. The planar type circular resonator acts as a series feedb...