Patent ID: 7678640

Claim:
A method of manufacturing a complimentary metal-oxide semiconductor (CMOS) circuit on a semiconductor substrate of a first conductivity type to adjust threshold voltages (V T ) of devices in the circuit, the method comprising: forming a first photoresist mask on a surface of the substrate, the first photoresist mask defining a well boundary around an area in which a well is to be formed; implanting ions into the substrate at an angle substantially perpendicular to the surface of the substrate to form a well of a second conductivity type in the substrate, wherein a region proximal to the well boundary is effected by lateral scattering by the first photoresist mask of the ions implanted to form the well; and forming at least one of the devices in the region proximal to the well boundary which is effected by lateral scattering, wherein a channel of the device is formed by implanting ions into the substrate at an acute angle to the surface thereof to shadow the portion of the channel from at least some of the ions implanted to form the channel.