Sensing device
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United States of America Patent
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Feb 20, 2018
Issued Date -
N/A
app pub date -
May 29, 2014
filing date -
Sep 3, 2013
priority date (Note) -
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Abstract
A sensing device includes a comparator, a first and a second variable capacitor unit. A first comparator input of the comparator is electrically coupled to a touch pad. The first variable capacitor unit is configured to charge the first comparator input such that the first comparator input has a first potential. The second variable capacitor unit is configured to charge a second comparator input of the comparator such that the second comparator input has a second potential. The comparator is configured for comparing the first potential and the second potential to generate a comparator output signal. In a condition of the touch pad being operated, the first variable capacitor unit is adjusted according to the comparator output signal to perform potential compensation for the first comparator input, or the second variable capacitor unit is adjusted according to the comparator output signal to perform potential compensation for the second comparator input.
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