Some of the embodiments of the present disclosure provide a system comprising a functional block; a plurality of power sources, each of the plurality of power sources being maintained at a corresponding voltage; and a switching module having a plurality of switches, the switching module configured to supply power from at least one of the plurality of power sources to the functional block, each of the plurality of switches being controlled by a corresponding switching signal having a voltage value that is one of (i) a ground voltage and (ii) a high max voltage, the high max voltage corresponding to a highest voltage among the voltages of the plurality of power sources. Other embodiments are also described and claimed.