Patent ID: 8222946

Claim:
A capacitive touching apparatus, comprising: at least an equivalent capacitor module, having a first terminal and a second terminal, wherein the first terminal receives a periodic driving signal and an output voltage is produced at the second terminal of the equivalent capacitor module according to the driving signal; a first comparator, coupled to the equivalent capacitor module, receiving the output voltage and comparing the output voltage with a first reference voltage so as to produce a first comparison result; a first reference current generator, coupled to the equivalent capacitor module and the first comparator and producing a first reference current and a second reference current according to a base current, wherein 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 second terminal of the equivalent capacitor module; and a first detection capacitor module, coupled to the first reference current generator to receive the second reference current and to thereby produce a first detection output signal.