Patent ID: 8891213
Filing Date: 2014-11-18
Classification: H01L

Abstract:
1. A bipolar ESD clamp apparatus, the apparatus comprising: a p-type silicon substrate comprising a surface region; an N-well region within the substrate, the N-well region being characterized by a first depth; a p-type high-voltage lightly-doped-drain (LDD) region disposed completely within the N-well region; an N+ region disposed completely within the high voltage LDD region, the N+ region being connected to a pad structure; a P+ region within the high voltage LDD region, the P+ region being connected to the pad structure; wherein the high voltage LDD region, the N-well region, and the substrate are associated with a first bipolar transistor, the first bipolar transistor being characterized by a first trigger voltage, and wherein the N+ region, the high voltage LDD region, and the N-well region are associated with a second bipolar transistor, the second bipolar transistor being characterized by a second trigger voltage, wherein the high voltage LDD region extends a first emitter of the first bipolar transistor, and wherein the first emitter of the first bipolar transistor is coupled to the P+ region.