Patent ID: 7399665

Claim:
A method of forming a silicon control rectifier, comprising: forming a blanket doped region having a net peak doping concentration in a silicon layer in direct physical contact with a buried oxide layer of a silicon-on-insulator substrate, a top surface of said silicon layer defining a horizontal plane; forming a first doped region in said silicon layer, said first doped region having a first net peak doping concentration, said first doped region dividing said blanket doped region into a second doped region having a second net peak doping concentration and a third doped region having a third net peak doping concentration, said second and third net peak doping concentrations being a same doping concentration, said first doped region between and abutting said second and third doped regions, said second and third doped regions not abutting; forming a fourth doped region in said silicon layer, said fourth doped region having a fourth net peak doping concentration in said silicon layer, said fourth doped region abutting only said second doped region; forming a fifth doped region in said silicon layer, said fifth doped region having a fifth net peak doping concentration in said silicon layer, said fifth doped region abutting only said third doped region; wherein a path of current flow from said fourth doped region, through said second doped region, said first doped region and said third doped region to said fifth doped region, is in a single horizontal direction parallel to said horizontal plane; wherein a net peak doping concentration of said fourth doped region is greater than a net peak doping concentration of said first doped region and a net peak doping concentration of said third doped region; and wherein a net peak doping concentration of said fifth doped region is greater than said net peak doping concentration of said first doped region and said net peak doping concentration of said third doped region.