Balanced resistance capacitive sensing apparatus
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United States of America Patent
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Jun 15, 2010
Grant Date -
Dec 24, 2009
app pub date -
Jun 24, 2008
filing date -
Jun 24, 2008
priority date (Note) -
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Abstract
Embodiments for a capacitive sensing apparatus with attenuated electrical interference across a plurality of routing traces are provided. One embodiment forms a first sensor electrode on a substrate. In addition, a first routing trace is formed on the substrate, the first routing trace coupled with the first sensor electrode. One embodiment additionally forms a second sensor electrode on the substrate. A second routing trace differing in length from the first routing trace is also formed on the substrate, the second routing trace coupled with the second sensor electrode. To attenuate electrical interference, the second routing trace is formed having an approximately equal RC time constant characteristic as the first routing trace.
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