Patent ID: 8581347

Claim:
A semiconductor device, comprising: a substrate; a first transistor that includes a first collector, a first base, and a first emitter, wherein the first collector includes a first doped well disposed in the substrate, the first base includes a first doped layer disposed above the substrate and over the first doped well, and the first emitter includes a doped element disposed over a portion of the first doped layer, wherein the first transistor is formed in a material layer; and a second transistor that includes a second collector, a second base, and a second emitter, wherein the second collector includes a doped portion of the substrate, the second base includes a second doped well disposed in the substrate and over the doped portion of the substrate, and the second emitter includes a second doped layer disposed above the substrate and over the second doped well, wherein the second transistor is formed in the material layer; and a Field-Effect-Transistor (FET) device having a portion thereof formed in the substrate, wherein the material layer has a polysilicon portion that serves as a gate electrode of the FET device, wherein one of the first and second transistors is an NPN-type transistor, and the other one is a PNP-type transistor.