Method and apparatus for active isolation in inductive loop detectors
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United States of America Patent
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-
Jan 8, 2002
Grant Date -
Nov 22, 2001
app pub date -
Jan 5, 2001
filing date -
Jan 5, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An oscillator circuit for use with a wire-loop inductive sensor and method for use. The oscillator circuit includes two balanced capacitors coupled to the wire-loop sensor, and an excitation circuit connectable with the capacitors at a selected polarity. Wherein, when the excitation circuit is connected to the capacitors, one of the capacitors is charged while the other capacitor is discharged, and both of the capacitors are discharged when the excitation circuit is disconnected to produce a pair of decaying oscillations having a caduceus-shaped output. The oscillator circuit highly attenuates common-mode noise detected by the wire-loop and differential noise from both ambient and crosstalk sources is filtered by active isolation.
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