한국정보통신설비학회:학술대회논문집

Korea Institute of Information and Telecommunication Facilities Engineering (한국정보통신설비학회)
권호 표지

Signal lock-in detection circuit for mobile device sensor systems

이동 통신 단말용 센서 시스템을 위한 신호 잠금 방식의 검출 회로

  • 정인일 (중앙대학교 전자전기공학부) ;
  • 손호현 (중앙대학교 전자전기공학부) ;
  • 최영환 (중앙대학교 전자전기공학부)
  • Published : 2008.08.29
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Abstract

In this paper we propose a lock-in detection method for portable sensor systems and demonstrate with the portable detection module that has high sensitivity and robustness against the noise. The simple portable sensor module is manufactured using MCU(Micro Contorl Unit), OPAMP, MOSFET and a pair of infrared sensor. Manufactured sensor module is testified in the noisy environment caused by an external light and an white noise source. Without any type of band pass filters, we recover a signal of 33 $mV_{p-p}$ in 80 $mV_{p-p}$ white noise and get the DR(Dynamic Reserve) of 14 dB.

Keywords