| 摘要 |
PURPOSE: An electrical contactless potential sensor circuit is provided to measure potential without direct electrical contact with a signal source by increasing the input impedance of a potential measuring sensor circuit. CONSTITUTION: A first amplifier is directly or indirectly provided with a measuring signal of a signal source through a positive input terminal in order to transmit the measuring signal to an output terminal. A bias circuit(253) is placed between the positive input terminal of the first amplifier and the output terminal and/or a ground connection of the first amplifier. The bias circuit guarantees the stable operation of the first amplifier. A negative input terminal of the first amplifier is directly connected to the output of the first amplifier. The bias circuit includes a bias resistance connected between the positive input terminal and the ground connection. [Reference numerals] (253) Bias circuit; (270) Resistant feedback circuit increasing Re; (280) Capacitive feedback circuit reducing Ce
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