Patent ID: 6291303
Filing Date: 2001-09-18
Classification: H01L

Abstract:
A method of manufacturing a bipolar junction device suitable for formation above a substrate of a first conductive type such that the substrate is patterned into a first region a second region and a third region, wherein the first region is used for forming a vertical npn bipolar junction transistor, the second region is used for forming a lateral npn bipolar junction transistor, and the third region is used for forming a lateral pnp bipolar junction transistor, the method comprising the steps of:forming a P-type first well in the first region and the second region, and forming an N-type first well in the third region;forming an N-type second well within the first well in the first region, two mutually isolated N-type second wells within the first well in the second region, and two mutually isolated P-type second wells within the first well in the third region;forming a plurality of isolation structures in the first, second and third regions in the neighborhood of junctions between the substrate and the first well as well as between the first well and the second well;forming an N-type first doped region within the second well in the first region, two mutually isolated N-type first doped regions within the two second wells in the second region, and an N-type first doped region within the first well in the third region; andforming two mutually isolated P-type second doped regions within the first well in the first region, a P-type second doped region within the first well in the second region, and two P-type second doped regions within the second wells in the third region.