a bandgap voltage generating circuit includes a circuit coupled to a first node and a second node , driving the first and the second nodes to the same voltage level . a first impedance element is coupled to the first node and a second impedance element is coupled to the second node , wherein the impedance of the second impedance element is larger than the impedance of the first impedance element . a first transistor is coupled to the first impedance element , and a second transistor is coupled to the second impedance element and the first transistor . the bandgap generating circuit generates a bandgap voltage at the second node .