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
Systems and methods for handling NIC congestion via NIC aware application
Substrate processing system
DC-DC converter and mobile communication terminal using the same
Automated system for load acquisition and engagement
Horizontal shackle for lock system and method
Disk chucking apparatus
  Randomly Featured Patents
Transmission system and transmission method, and reception system and reception method
Power conducting system for long distances
Wide-view-angle and planarized-packing structure for IR heat sensing elements
Recovery of N-hydrocarbylthiophosphoric triamides and N-hydrocarbylphosphoric triamides from reaction mixtures
Audio output device having digital signal processor for responding to commands issued by processor by emulating designated functions according to common command interface
Oleophilic, film-forming photopolymerizable diazo and epoxy resin compositions and lithographic plates prepared therefrom
Portable information terminal unit
Veterinary preparations
Cellulose propionate n-butyrate and coating compositions containing same
Impact driven tree transplanting apparatus