EMI resistant balanced touch sensor and method
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United States of America Patent
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Issued Date -
Jan 12, 2006
app pub date -
Jun 24, 2004
filing date -
Jun 24, 2004
priority date (Note) -
Abandoned
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Abstract
An EMI resistant, low impedance touch sensor detects contact of a dielectric substrate by an operator's appendage or body part, a metal object, or the proximity of a moving fluid/gas interface. The touch sensor includes a first conductive electrode pad and a second conductive electrode of substantially equal area which is spaced from the first electrode by a channel of non-conductive dielectric. The first and second electrodes are optionally disposed on the same surface of the substrate. An active electrical component including an oscillator and a differential sensing circuit is located on the substrate proximate the first and second electrodes and is electrically coupled to the first and second electrodes. Noise or interference signals appearing on both the first and second electrodes, being of substantially equal area, are subtracted from one another through to provide common mode rejection of EMI.
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