An electronic device includes a first switch circuit, a second switch circuit, and a mechanical switch. The first switch circuit is coupled to a control node. The first switch circuit is configured to generate a first control voltage. The second switch circuit is coupled to the control node. The second switch circuit is configured to generate a second control voltage. The mechanical switch is configured to selectively couple the control node to a ground voltage. When the first switch circuit is switched, the second control voltage is not affected. When the second switch circuit is switched, the first control voltage is not affected.