An apparatus comprising a first voltage domain circuit including a first circuit component configured to provide a first digital output signal; a second voltage domain circuit comprising a second circuit component; a level shifter arrangement configured to receive the first digital output signal and generate a second digital output signal based thereon with an increased voltage level of the high state, and provide said second digital output signal to the second circuit component; wherein the level shifter arrangement comprises at least one stage, the at least one stage comprising an arrangement of one or more diode-connected PMOS transistors, coupled to a CMOS inverter arrangement; the CMOS inverter arrangement of a first of the at least one stages configured to receive the first digital output signal and the CMOS inverter arrangement of a final stage of the at least one stages configured to output said second digital output signal.