A method of operating a level shifting circuit includes receiving, at a bias circuit, a first voltage level and a second voltage level, generating, from the bias circuit, a bias voltage having the greater of the first voltage level or the second voltage level, receiving the first voltage level at a source/drain (S/D) terminal of a first PMOS transistor included in a level shifter, receiving the second voltage level at a S/D terminal of a second PMOS transistor included in the level shifter, and receiving the bias voltage at a bulk terminal of each of the first PMOS transistor and the second PMOS transistor.