A Novel Vital-Sign Sensor Based on a Self-Injection-Locked Oscillator

  title={A Novel Vital-Sign Sensor Based on a Self-Injection-Locked Oscillator},
  author={Fu-Kang Wang and Chien-Jung Li and Chieh-Hsun Hsiao and Tzyy-Sheng Horng and Jenshan Lin and Kang-Chun Peng and Je-Kuan Jau and Jian-Yu Li and Cheng-Chung Chen},
  journal={IEEE Transactions on Microwave Theory and Techniques},
A novel vital-sign sensor with a self-injection-locked oscillator and a frequency demodulator to reduce system complexity and improve sensitivity is proposed. The theory provides a delta-sigma model to account for the excellent signal-to-noise spectral density ratio in a parametric study of the sensitivity performance. Then, the experiments verify the sensing principle and the predicted performance. Accordingly, a prototype sensor with high sensitivity is realized for noncontact cardiopulmonary… CONTINUE READING
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