Circuit and method for sensing a capacitance
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United States of America Patent
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Feb 7, 2017
Grant Date -
Sep 17, 2015
app pub date -
Jun 2, 2015
filing date -
Dec 10, 2010
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Abstract
A transconductance amplifier mirror circuit is connected to an electrode for sensing the capacitance of the electrode with reference to ground, or the capacitance between the electrode and another electrode. A voltage level change is produced on the electrode connected to the transconductance amplifier mirror circuit to cause the transconductance amplifier mirror circuit to supply charges to or drain charges from a charge calculation circuit. The charge amount variation is converted to a signal for calculating the sensed capacitance.
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