Patent ID: 7910425

Claim:
A process for forming bipolar junction transistors and metal oxide semiconductor field effect transistors over a substrate, the process comprising: forming a first doped tub and a plurality of doped collector sinker regions within the substrate; forming a second and a third doped tub within the substrate; forming a triple well region for cooperating with the second and the third doped tubs to electrically isolate the first doped tub from the substrate and forming a first plurality of subcollector regions comprising a first doping level; forming structures associated with the metal oxide semiconductor field effect transistor; doping a first subset of the first plurality of subcollector regions to form a second plurality of subcollector regions while doping other regions of the substrate to form a third plurality of subcollector regions, wherein the second plurality of subcollector regions comprise a second doping level and the third plurality of subcollector regions comprise a third doping level; and doping a second subset of the first plurality of subcollector regions to form a fourth plurality of subcollector regions while doping a subset of the third plurality of subcollector regions to form a fifth plurality of subcollector regions and while doping a subset of the first subset of the first plurality of subcollector regions to form a sixth plurality of subcollector regions, wherein the fourth plurality of subcollector regions comprise a fourth doping level, and wherein the fifth plurality of subcollector regions comprise a fifth doping level, and wherein the sixth plurality of subcollector regions comprise a sixth doping level.