A method of fabricating an organic thin film transistor is provided. In an embodiment of the invention, the technique provides linear spine interconnect routing. End point detection includes monitoring energy reflected from a specially prepared replica of the material to be ablated, whose thickness and consistency match the active workpiece area. Also, the system has a timing generator generating a timing signal with a cycle time equal to or less than the shortest time constant of the converter module and immediate power circuit elements relating to the converter module.