SENSING DEVICE

摘要

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.

主权项

1. A sensing device comprising:
a comparator comprising a first comparator input and a second comparator input, the first comparator input configured to be electrically coupled to a first touch pad; a first variable capacitor unit electrically coupled to the first comparator input, the first variable capacitor unit configured to charge the first comparator input with at least one first driving signal, such that the first comparator input has a first potential; and a second variable capacitor unit electrically coupled to the second comparator input, the second variable capacitor unit configured to charge the second comparator input with at least one second driving signal, such that the second comparator input has a second potential, wherein the comparator is configured to compare the first potential with the second potential to generate a comparator output signal; wherein in a condition of the first 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.