Resources Contact Us Home
Substrate backgate for trigate FET

Image Number 12 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
Kinase and ubiquination assays
Automatic club setting and ball flight optimization
Heterojunction solar cell
Sideband error signaling
Methods and systems for differentiating soybeans
System and method for location, time-of-day, and quality-of-service based prioritized access control
Document handling
  Randomly Featured Patents
Continuous-cycle electroplating plant
Method of selling merchandise on a golf course
Substituted 8-phenylxanthines useful as antagonists of A2B adenosine receptors
Human laminin receptor crystal and uses thereof
Method for chemical-mechanical planarization of a substrate on a fixed-abrasive polishing pad
Laser leveling device
Abrasive tool insert
Method for improvement of the efficiency of a wind turbine rotor
Rasterization of primitives using parallel edge units
Automated system and method for managing a process for the shopping and selection of human entities