Patent ID: 7917316

Claim:
A test workstation computer system including a memory for storing program instructions for characterizing threshold voltage variation within an array, a processor for executing said program instructions, and an interface to a characterization array circuit, wherein said program instructions comprise program instructions for: selecting a device within said array as a device under test using said interface; controlling said interface to enable a circuit within said characterization array that provides a predetermined current through a channel of said device under test while providing a predetermined channel voltage across said channel and a predetermined gate voltage at a gate terminal of said device under test; measuring a source voltage at a source terminal of said device under test; repeating said program instructions for selecting, said providing and said measuring for multiple devices within said array to obtain a set of source voltage measurements; computing a set of threshold voltages for said multiple devices from said set of source voltage measurements by applying an adjustment value; and analyzing said set of threshold voltages to generate a description of said threshold voltage variation.