Patent ID: 6885214
Filing Date: 2005-04-26
Classification: G01R

Abstract:
1. An apparatus for characterizing an insulating layer constructed between a conductive gate and a substrate, comprising: at least one test structure formed at a surface of a substrate, each test structure comprising: a thin insulating layer placed above the each source region, each drain region, and the bulk region between said source region and said drain region, and a capacitance-voltage measuring device having a sense probe in contact the conductive gate of each test structure, a stimulus probe in contact with the source and drain region of each test structure to measure a capacitance value of said test structure, and a bulk biasing probe to force said bulk region between said source and drain region to a second voltage level, whereby said second voltage level forces said bulk region to an inversion, said capacitance-voltage measuring device varying a first voltage at said source and drain region to force said test structure into the inversion state and measuring a first capacitance of said test structure.