In one embodiment, an implantable pulse generator (IPG) for generating electrical pulses for stimulation of tissue of a patient, comprises: a controller for controlling operations of the IPG pulse generating circuitry for generating electrical pulses and conversion circuitry for converting a received logic signal generated by a first voltage domain for provision to a second voltage domain, the conversion circuitry comprising a first stage and a second stage, wherein (i) the first stage receives first signals at first and second logic levels (ii) the second stage receives second signals at third and fourth logic levels, (iii) the second stage comprising two sets of cross-coupled transistors for generating a rail-to-rail output at the third and fourth logic levels according to whether the received logic signal is at the first or second logic level.
