Patent ID: 8436822

Claim:
A touch panel, comprising: a first clock phase generator, generating a first phase signal and a second phase signal according to a first clock signal; a panel capacitor; a first capacitor; a second capacitor; a first switch, turned on/off based on a voltage level of the first phase signal, wherein a first end of the first switch is coupled to a first reference voltage, and a second end of the first switch is coupled to the panel capacitor; a second switch, turned on/off based on a voltage level of the second phase signal, wherein a first end of the second switch is coupled to the panel capacitor; a third switch, turned on/off based on the voltage level of the first phase signal, wherein a first end of the third switch is coupled to a second reference voltage, and a second end of the third switch is coupled to the first capacitor; a fourth switch, turned on/off based on the voltage level of the second phase signal, wherein a first end of the fourth switch is coupled to the first capacitor, and a second end of the fourth switch is coupled to a second end of the second switch; a control circuit, coupled to the second end of the second switch and the second end of the fourth switch, wherein the control circuit generates a third phase signal and a fourth phase signal based on a third reference voltage and a voltage level of the second end of the second switch; a fifth switch, turned on/off based on a voltage level of the third phase signal, wherein a first end of the fifth switch is coupled to the second reference voltage, and a second end of the fifth switch is coupled to the second capacitor; and a sixth switch, turned on/off based on a voltage level of the fourth phase signal, wherein a first end of the sixth switch is coupled to the second capacitor, and a second end of the sixth switch is coupled to the second end of the second switch and the second end of the fourth switch.