Patent ID: 9613968
Date: 2017-04-04
CPC Classifications: G11C,H01L

Claim:
1. A first semiconductor structure for a cross-coupled pair of first type and opposite type bipolar transistors comprising: a semiconductor substrate of first conductivity type having an upper surface; an insulating region extending into the substrate to surround a first portion of the upper surface of the substrate; a buried layer of the opposite conductivity type to the first conductivity type disposed in the substrate beneath the first portion of the upper surface, the buried layer and the insulating region together providing a tub of the first conductivity type electrically isolated from remaining portions of the substrate; a connecting region of the opposite conductivity type extending from the upper surface of the substrate to the buried layer to provide an electrical connection to the buried layer; a shallow well region of the opposite conductivity type extending from the upper surface of the substrate over less than all of the first portion of the upper surface of the substrate, the shallow well region not extending to the buried layer; a first connection of the first conductivity type adjacent the upper surface and extending into the tub to provide an electrical connection to the tub; a field effect transistor gate electrode disposed over the shallow well region; a second connection of the opposite conductivity type extending into the shallow well region to provide an electrical connection to the shallow well region disposed adjacent a first side of the field effect transistor gate electrode; an emitter region of the first conductivity type disposed adjacent a second side of the field effect transistor gate electrode; and wherein: