JSTS:Journal of Semiconductor Technology and Science

The Institute of Electronics and Information Engineers (대한전자공학회)
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A Multi-purpose Fingerprint Readout Circuit Embedding Physiological Signal Detection

  • Eom, Won-Jin (School of electrical and computer engineering, Ulsan National Institute of Science and Technology) ;
  • Kim, Sung-Woo (School of electrical and computer engineering, Ulsan National Institute of Science and Technology) ;
  • Park, Kyeonghwan (School of electrical and computer engineering, Ulsan National Institute of Science and Technology) ;
  • Bien, Franklin (School of electrical and computer engineering, Ulsan National Institute of Science and Technology) ;
  • Kim, Jae Joon (School of electrical and computer engineering, Ulsan National Institute of Science and Technology)
  • Received : 2016.03.18
  • Accepted : 2016.08.28
  • Published : 2016.12.30
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Abstract

A multi-purpose sensor interface that provides dual-mode operation of fingerprint sensing and physiological signal detection is presented. The dual-mode sensing capability is achieved by utilizing inter-pixel shielding patterns as capacitive amplifier's input electrodes. A prototype readout circuit including a fingerprint panel for feasibility verification was fabricated in a $0.18{\mu}m$ CMOS process. A single-channel readout circuit was implemented and multiplexed to scan two-dimensional fingerprint pixels, where adaptive calibration capability against pixel-capacitance variations was also implemented. Feasibility of the proposed multi-purpose interface was experimentally verified keeping low-power consumption less than 1.9 mW under a 3.3 V supply.

Keywords

References

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