A voltage generating circuit comprising: a first switch circuit, operating in a first power domain; a second switch circuit, operating in a second power domain; a first transistor of first type, comprising a control terminal coupled to the first switch circuit and the second first switch circuit, wherein the control terminal of the first transistor of first type is coupled to a predetermined voltage source via the first switch circuit if the first switch circuit is active, wherein the control terminal of the first transistor of first type is coupled to the predetermined voltage source via the second switch circuit if the second switch circuit is active; and an output circuit, coupled to the first transistor of first type and operating in the second power domain.