Patent ID: 6734502
Filing Date: 2004-05-11
Classification: H01L

Abstract:
Field effect transistor circuitry comprising:a silicon-on-insulator semiconductive substrate; a field effect transistor having a body within the substrate, the transistor having a gate; a voltage divider circuit formed over the substrate and connected with the gate, the body, and a reference voltage node, the circuit being configured to selectively change threshold voltages of the field effect transistor when a gate voltage of the field effect transistor changes from high to low, and vice versa, wherein the voltage divider circuit comprises: a conductive line formed from polycrystalline silicon, at least a portion of the conductive line providing the gate for the transistor, the conductive line extending to the voltage reference node; and selected portions of the conductive line being doped to form first and second resistive elements, and further comprising: a buried contact diffusion region within the substrate, wherein the conductive line is formed over and in electrical communication with the buried contact diffusion region.