Capacitive touching apparatus
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United States of America Patent
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Jul 17, 2012
Grant Date -
Jan 5, 2012
app pub date -
Aug 17, 2010
filing date -
Jun 30, 2010
priority date (Note) -
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Abstract
The invention provides a capacitive touching apparatus, which includes at least an equivalent capacitor module, a first comparator, a first reference current generator, a first detection capacitor module and a selection switch module. The equivalent capacitor module receives a periodic driving signal and produces an output voltage according to the driving signal. The first comparator compares the output voltage with a first reference voltage and thereby produces a first comparison result. The first reference current generator produces a first reference current and a second reference current according to a base current, in which the first reference current generator decides whether to respectively output the first reference current and the second reference current according to the first comparison result, and the first reference current is output to the equivalent capacitor module. The first detection capacitor module produces a first detection output signal according to the second reference current.
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