Patent ID: 10886418

Abstract:
An IC with a split-gate transistor includes a substrate doped the second conductivity type having a semiconductor surface layer doped the first conductivity type. The transistor includes a first doped region formed as an annulus, a second doped region including under the first doped region, and a third doped region under the second doped region, all coupled together and doped the second conductivity type. A fourth doped region doped the first conductivity type is above the third doped region. A fifth doped region doped the first conductivity type is outside the annulus. Sixth doped regions doped the first conductivity type include a first sixth doped region surrounded by the annulus in the semiconductor surface layer and a second sixth doped region in the fifth doped region. Field oxide includes a field oxide portion between the fifth and the first doped region. A field plate is on the field oxide portion.