Patent ID: 6639284
Filing Date: 2003-10-28
Classification: H01L

Abstract:
An integrated circuit, comprising:functional circuitry, coupled to a terminal; and an electrostatic discharge protection device connected to the terminal in parallel with the functional circuitry, and formed at a seniconducting surface of a substrate, comprising: a first well of a first conductivity type, disposed at the surface within a portion of the substrate of the second conductivity type; a first doped region of a first conductivity type, disposed within the first well; a second doped region, of a second conductivity type, disposed within the first well and connected to the terminal; and a grounded doped region, disposed at the surface within a portion of the substrate of the second conductivity type; wherein a compensated well portion of the first well underlying the second doped region has a lower net number of impurities than other portions of the first well.