The present disclosure provides a mobile device. The mobile device includes a casing, configured to accommodate or support the mobile device; a thin touchscreen, including at least one driving electrode and at least one receiving electrode, wherein the driving electrode is configured to receive a driving signal, and the receiving electrode is configured to generate a sensing signal to sense a touch operation; a capacitive sensing system, including a sense circuit, coupled to the at least one receiving electrode and configured to generate the driving signal and receive the sensing signal to determine the touch operation; and a power supply unit, configured to output a supply voltage and a ground voltage; and an isolation module, configured to isolate the supply voltage from the ground voltage.