A phase change memory may have reduced reverse bias current by providing a N-channel field effect transistor coupled between a bipolar transistor and a conductive line such a row line. The control valve has five control edges, with two separate line paths formed to feed the fluid forced out of the small stroke space back with a back-feed control edge and a pressure-release control edge is formed to release pressure from the small stroke space to the tank. The transducers all receive their respective calibrated voltage values all at the same time utilizing a single current slope delivered to each.