Resources Contact Us Home
Substrate backgate for trigate FET

Image Number 13 for United States Patent #7411252.

Disclosed is a tri-gate field effect transistor with a back gate and the associated methods of forming the transistor. Specifically, a back gate is incorporated into a lower portion of a fin. A tri-gate structure is formed on the fin and is electrically isolated from the back gate. The back gate can be used to control the threshold voltage of the FET. In one embodiment the back gate extends to an n-well in a p-type silicon substrate. A contact to the n-well allows electrical voltage to be applied to the back gate. A diode created between the n-well and p-substrate isolates the current flowing through the n-well from other devices on the substrate so that the back gate can be independently biased. In another embodiment the back gate extends to n-type polysilicon layer on an insulator layer on a p-type silicon substrate. A contact to the n-type polysilicon layer allows electrical voltage to be applied to the back gate. A trench isolation structure extending through the polysilicon layer to the insulator layer isolates current flowing through the polysilicon layer from other devices on the silicon substrate.

  Recently Added Patents
Fluid intake and content management system
Method and apparatus for focusing electrical stimulation in the brain during electro-convulsive therapy
Methods and systems for managing electronic messages
Automatic portable electronic device configuration
Automatic image-content based adjustment of printer printing procedures
Mobile device case with storage compartment
Image sensor with improved color crosstalk
  Randomly Featured Patents
Agricultural sweep and mounting
Closing member for compressed air carrying polygonal tubes on a yarn spinning machine
Image processing apparatus
Cryogenic rectification system with intermediate temperature turboexpansion
Process for preparing .alpha.-phenylpropionic acid derivative
Process for producing ethyl alcohol from cellulosic materials
Screw mechanism
Control device and a control method for twin-roll continuous caster
Earth-boring bit having cobalt/tungsten carbide inserts
Inducible one-component plant gene tagging