A method and an apparatus for voltage level shifting are described. A
voltage level shifter includes two level shifting circuits and a
differential amplifier. The differential amplifier forms a feedback loop
with one level shifting circuit. The feedback loop controls the level
shifting operation of both level shifting circuits. The differential
amplifier can operate to provide a control signal that causes a
level-shifted signal in the feedback loop to match a target signal. The
two level shifting circuits can perform their level shifting operation
based on the control signal.