发明公开
EP1219967A1 IMPEDANCE DETECTOR CIRCUIT, IMPEDANCE DETECTOR AND METHOD OF IMPEDANCE DETECTION
有权
IMPEDANZMESSUNGSSCHALTKREIS，DETERKTOR UND VERFAHREN ZUR IMPEDANZMESSUNG
- 专利标题： IMPEDANCE DETECTOR CIRCUIT, IMPEDANCE DETECTOR AND METHOD OF IMPEDANCE DETECTION
- 专利标题（中）： IMPEDANZMESSUNGSSCHALTKREIS，DETERKTOR UND VERFAHREN ZUR IMPEDANZMESSUNG
-
申请号： EP01912131.8申请日： 2001-03-07
-
公开(公告)号： EP1219967A1公开(公告)日： 2002-07-03
- 发明人: YAKABE, Masami , MATSUMOTO, Toshiyuki , HIROTA, Yoshihiro , NAKANO, Koichi
- 申请人： SUMITOMO METAL INDUSTRIES, LTD. , Hokuto Electronics, Inc.
- 申请人地址： 5-33, Kitahama 4-chome, Chuo-ku Osaka-shi, Osaka 541-0041 JP
- 专利权人： SUMITOMO METAL INDUSTRIES, LTD.,Hokuto Electronics, Inc.
- 当前专利权人： SUMITOMO METAL INDUSTRIES, LTD.,Hokuto Electronics, Inc.
- 当前专利权人地址： 5-33, Kitahama 4-chome, Chuo-ku Osaka-shi, Osaka 541-0041 JP
- 代理机构： Balsters, Robert
- 优先权： JP2000062504 20000307
- 国际公布： WO0167118 20010913
- 主分类号： G01R27/02
- IPC分类号： G01R27/02 ; G01R27/26 ; G01D5/24
摘要：
A second operational amplifier (11) of a core unit (1) shorts an inverting input terminal and an output terminal. A signal line (19) is connected to a non-inverting input terminal. A capacitive sensor (18) is connected to the signal line (19). A first operational amplifier (12) earths the non-inverting input terminal. One end of a first resistance (15) and one end of a second resistance (16) are respectively connected to the inverting input terminal. The other end of the first resistance (15) is connected to an alternate current voltage generator (14). The other end of the second resistance (16) is connected to the output terminal of the first operational amplifier (11). A signal output terminal (21) of the core unit (1) is connected to an inverting amplification device (2). An alternate output terminal (22) of the core unit (1) and an inverting output terminal (42) of the inverting amplification device (2) are connected to an addition device (3). The non-inverting input terminal of operational amplifiers (36) and (40).
公开/授权文献
信息查询
