Patent ID: 7827509

Claim:
A system for digitally obtaining contours of fabricated polygons, comprising: a plurality of test transistors including a plurality of poly-silicon gates formed by a plurality of identical polygons, said plurality of identical polygons being fabricated, based on a GDS polygon described in a Geographic Data System (GDS) file, with a same fabrication process such that shapes of said plurality of identical polygons are altered by optical effects in a same or similar way, a position of source and drain islands along a length of a poly-silicon gate for each of said plurality of test transistors being different, sources of said plurality of test transistors being connected to ground; a decoder for selecting one of said plurality of test transistors; a first flip-flop, placed at a beginning of said system, for launching a pulse in synchronization with a clock; a plurality of AND gates, each of said AND gates receiving a first input from said decoder and a second input from said first flip-flop and outputting a value to said poly-silicon gate of said each of said plurality of test transistors; a plurality of isolation transistors, a source of each of said plurality of isolation transistors being connected to a drain of said each of said plurality of test transistors, a gate of said each of said plurality of isolation transistors being connected to said poly-silicon gate of said each of said plurality of test transistors, drains of said plurality of isolation transistors being tied together; a load, connected to and driven by said drains of said plurality of isolation transistors, being charged to V DD when none of said plurality of test transistors is active and being discharged through one of said plurality of test transistors when said one of said plurality of test transistors is activated; and a second flip-flop, placed at an end of said system and connected to said load, for capturing a test response at a next clock cycle.