A method includes, in at least one aspect, connecting an input of a bias circuit and an output of the bias circuit to another circuit while the other circuit is in a first power mode, such that the bias circuit has an operating state corresponding to the first power mode; switching the input of the bias circuit and the output of the bias circuit from the other circuit to a dummy circuit when a power mode of the other circuit is changed from the first power mode to a second power mode; and maintaining the bias circuit at the operating state corresponding to the first power mode using the dummy circuit while the other circuit is in the second power mode.