发明名称 |
IMPEDANCE DETECTOR CIRCUIT, IMPEDANCE DETECTOR AND METHOD OF IMPEDANCE DETECTION |
摘要 |
<p>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). <IMAGE></p> |
申请公布号 |
EP1219967(A1) |
申请公布日期 |
2002.07.03 |
申请号 |
EP20010912131 |
申请日期 |
2001.03.07 |
申请人 |
SUMITOMO METAL INDUSTRIES, LTD.;HOKUTO ELECTRONICS, INC. |
发明人 |
YAKABE, MASAMI;MATSUMOTO, TOSHIYUKI;HIROTA, YOSHIHIRO;NAKANO, KOICHI |
分类号 |
G01D5/24;G01R27/02;G01R27/26;(IPC1-7):G01R27/02 |
主分类号 |
G01D5/24 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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