发明申请
- 专利标题： AMPLIFYING DEVICE FOR CONDENSER MICROPHONE
- 专利标题（中）： 冷凝器麦克风放大器
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申请号： US13129702申请日： 2010-09-03
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公开(公告)号： US20120014541A1公开(公告)日： 2012-01-19
- 发明人: Kazuya Nakayama , Shigeo Masai
- 申请人： Kazuya Nakayama , Shigeo Masai
- 优先权： JP2010-099774 20100423
- 国际申请： PCT/JP2010/005429 WO 20100903
- 主分类号： H04R3/00
- IPC分类号： H04R3/00
摘要：
An amplifying device for a condenser-microphone according to the present invention includes: a differential amplifier (20) having an inverting input terminal (1) to which a sound pressure signal output from a condenser microphone (21) is input and a non-inverting input terminal (2) to which a dc bias voltage is applied; a capacitor (24) connected between an output terminal (3) of the differential amplifier (20) and the inverting input terminal (1) of the differential amplifier (20); a resistive element (23) connected, in parallel with the capacitor (24), between the output terminal (3) of the differential amplifier (20) and the inverting input terminal (1) of the differential amplifier (20); and an ESD protecting element (25) having bidirectional diode characteristics, the ESD protecting element (25) being connected, in parallel with the capacitor (24), between the output terminal (3) of the differential amplifier (20) and the inverting input terminal (1) of the differential amplifier (20).