Methods and circuits for measuring mutual and self capacitance
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United States of America Patent
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Jan 22, 2013
Grant Date -
Feb 23, 2012
app pub date -
Feb 27, 2009
filing date -
Feb 27, 2008
priority date (Note) -
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Abstract
A capacitance measurement circuit for measuring self and mutual capacitances may include a first electrode capacitively coupled with a second electrode, a first plurality of switches coupled with the first electrode, and a second plurality of switches coupled with the second electrode, wherein, during a first operation stage, the first plurality of switches is configured to apply a first initial voltage to the first electrode and the second plurality of switches is configured to apply a second initial voltage to the second electrode, and wherein, during a second operation stage, the first plurality of switches is configured to connect the first electrode with a measurement circuit, and the second plurality of switches is configured to connect the second electrode with a constant voltage.
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