Patent ID: 8748235

Claim:
A method of manufacturing a one-time-programmable n-channel diode-connectable transistor comprising: forming an thick oxide region on an n-type substrate; implanting a Pwell region into the substrate; growing a gate insulation on the Pwell region; depositing poly-silicon on the gate insulation; etching the poly-silicon to form a poly-silicon gate; implanting an n-type dopant having a first concentration into the poly-silicon gate and a portion of the Pwell wherein the n-type doped portion of the Pwell becomes a source; depositing photo-resist over the poly-silicon gate, thick oxide and source; etching the photo-resist to leave a mask over a first portion of the poly-silicon gate and over a first portion of the source; implanting an n-type dopant having a second concentration into areas not covered by the mask; removing the mask; forming a metal contact on the more highly doped portion of the poly-silicon gate and on the more highly doped portion of the source.