Trimming and Printing of Embedded Resistors Using Demand-Mode Ink-Jet Technology and Conductive Polymer

Abstract

This paper presents a method both to enhance the yield of embedded resistor processes and to print embedded resistors using drop-on-demand ink-jet device to dispense a precise volume of intrinsically conductive polymers (ICPs) on to plated or screen printed resistors. By controlling the volume of ICPs, and in turn its thickness, the resistance per square can be controlled and brought to the PWB industry tolerance. This method can be used as complimentary to laser trimming method to enhance the overall yield of embedded passives processes.