Synopsys, Inc.
One-time programmable bitcell with native anti-fuse

Abstract:

A one-time programmable memory device includes a well of a first polarity in a semiconductor substrate. A lightly-doped drain (LDD) region is above one portion of the well. The LDD region has a first doping concentration and a second polarity that is opposite the first polarity. A source region or a drain region of the second polarity is above another portion of the well. The source region or the drain region has a second doping concentration that is higher than the first doping concentration. A first breakdown voltage between the LDD region and the well region is higher than a second breakdown voltage between the source region or the drain region and the well region. A select device is positioned at least partially above a portion of the source region or the drain region. The select device is configured to form a channel between the source region or the drain region and the LDD region. An anti-fuse device is positioned at least partially above a portion of the LDD region.