Capacitive sensing system and method
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United States of America Patent
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Feb 13, 2018
Issued Date -
N/A
app pub date -
Oct 29, 2014
filing date -
Nov 14, 2013
priority date (Note) -
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Abstract
The invention provides a capacitive sensor circuit in which a capacitance to be sensed is selectively coupled into a ring oscillator circuit. The ring oscillator frequency is measured with the capacitance coupled and not coupled, and a capacitance is derived from the change in ring oscillator frequency.
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