Patent ID: 7095094
Filing Date: 2006-08-22
Classification: H01L

Abstract:
1. A semiconductor integrated circuit comprising a plurality of bipolar junction transistors disposed in a semiconductor substrate, the integrated circuit comprising: a first subcollector region having a first doping level; a second subcollector region having a second doping level; a third subcollector region having a third doping level; a fourth subcollector region having the first doping level and a portion thereof having a fourth doping level, wherein a combination of the first and the fourth doping levels produces a fifth doping level for the fourth subcollector region; a fifth subcollector region having the second doping level and a portion thereof having the fourth doping level, wherein a combination of the second and the fourth doping levels produces a sixth doping level for the fifth subcollector region; and a sixth subcollector region having the third doping level and a portion thereof having the fourth doping level, wherein a combination of the third and the fourth doping levels produces a seventh doping level for the sixth sub collector region.