Patent ID: 8748271

Claim:
A method comprising: forming a first well and a second well in a substrate, the second well surrounding the first well; doping the first well with a first conductivity type dopant and the second well with a second conductivity type dopant; forming one source in the first well and one drain in the second well; forming a doped region of the first conductivity type dopant in the first well, the doped region functioning as a body contact to the first well; forming first and second coplanar gate stacks on the substrate, a major portion of the first gate stack being formed over a portion of the first well and the second gate stack being formed over a portion of the second well, but not over the first well; and tuning the work functions of the first and second gate stacks to obtain a higher work function for the second gate stack than for the first gate stack, wherein the one source and the one drain are each associated with both the first and second coplanar gate stacks.