| 摘要 |
<p>An amplifier circuit (6) is provided with first and second amplifier units (7, 8). A first detection electrode (2) and a high-impedance circuit (4) are connected to an input terminal of the first amplifier unit (7). A second detection electrode (3) and a high-impedance circuit (5) are connected to an input terminal of the second amplifier unit (8). Output terminals of the first and second amplifier unit (7, 8) are adapted to output first and second output signals (V1, V2) and are connected to input terminals (16A, 16B), respectively, of a differential amplifier circuit (16) via coupling capacitors (14, 15). The differential amplifier circuit (16) calculates the difference between the first and second output signals (V1, V2) in a state in which the direct-current component is omitted.</p> |
