Invention Application
US20150215698A1 METHOD AND APPARATUS FOR ULTRA-LOW POWER SWITCHING MICROPHONE 有权
用于超低功率开关麦克风的方法和装置

  • Patent Title: METHOD AND APPARATUS FOR ULTRA-LOW POWER SWITCHING MICROPHONE
  • Patent Title (中): 用于超低功率开关麦克风的方法和装置
  • Application No.: US14600026
    Application Date: 2015-01-20
  • Publication No.: US20150215698A1
    Publication Date: 2015-07-30
  • Inventor: Moshe Haiut
  • Applicant: DSP Group LTD.
  • Main IPC: H04R3/00
  • IPC: H04R3/00
METHOD AND APPARATUS FOR ULTRA-LOW POWER SWITCHING MICROPHONE
Abstract:
A scheme is described to switch the power supply to the MEMS microphone on and off in a cyclic manner that is synchronized with the associated ADC sampling rate. In this way the MEMS microphone amplifier, whether it is a J-FET transistor or an operational amplifier, is off most of the cycle time, and is turned on only for a few micro-seconds prior to the sample-and-hold timing of the ADC device. By this method, the average power consumption of an existing analog MEMS microphone can be reduced by a factor of 10 or more.
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