Patent ID: 6107106
Filing Date: 2000-08-22
Classification: H01L

Abstract:
A method of generating a production mask for mass production of semiconductor devices including transistors, the method comprising:(a) designing an integrated circuit including MOS transistors with expected circuit parameters including a threshold voltage parameter for said transistors;(b) preparing the integrated circuit designed in said designing step;(c) performing a diagnostic test on the integrated circuit to determine an actual threshold voltage for one or more of said transistors;(d) comparing said actual threshold voltage with an expected threshold voltage from said step of designing said integrated circuit;(e) if said actual threshold voltage differs from said expected threshold voltage, adjusting said actual threshold voltage by irradiating selected portions of said integrated circuit with focused ion beam; and(f) when said actual threshold voltage is corrected in accordance with said expected threshold voltage from said step of designing said integrated circuit, preparing a mask for said integrated circuit according to a design of said integrated circuit generated in said step of designing said integrated circuit and according to said adjustment made to said integrated circuit with said focused ion beam.