| 摘要 |
<p>An electronic circuit for detecting a change with respect to a quiescent condition, which circuit includes oscillation means comprising at least a first and a second oscillator circuit, each circuit comprising an oscillator input terminal and an oscillator output terminal on which an oscillation signal is present, the oscillator input of the first oscillator circuit being coupled with the oscillator output of the second oscillator circuit, and the oscillator input of the second oscillator circuit being coupled with the output of the first oscillator circuit, as well as detection means comprising at least a first and a second detection circuit, each circuit comprising a detection input terminal and a detection output terminal on which a detection signal is present, while the detection means are arranged for detecting a change between the oscillation signals of the at least two oscillator circuits as a result of an external influence. The circuit is suitable for applications where otherwise a capacitive, inductive or Hall sensor is used. An example of an application is its use as a proximity switch.</p> |
