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AssigneeElan Microelectronics Corporation
InventorsChia-Hsing Lin, Han-Wei Chen, Jyun-Yu Chen
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The present invention is related to a capacitive touch device and excitation signal generating circuit and method thereof. The excitation signal generating circuit is connected to multiple sensing traces of the capacitive touch device, and has a storage unit storing at least one set of digital data. Each set of digital data is corresponding to a frequency. The PDM signal generator reads the set of digital data and converts the read set of digital data to a PDM signal according to the frequency of the read set of digital data. The PDM signal is recovered to an analog excitation signal since the PDM signal passes through a current transmission path, which is equivalent to a low pass filter. Therefore, the present invention can decrease a distortion of the sensing signal to increase accuracy of the sensing signal and to save power.
An excitation signal generating circuit of a capacitive touch device, which is used to electronically connected to multiple sensing traces, comprising:
A capacitive touch device, comprising:
An excitation signal generating method of a capacitive touch device having multiple sensing traces, comprising steps of:
Dependencies are inferred from the claim text.