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
Automobile body
Image processing apparatus, method, and storage medium for performing soft proof processing
High dynamic range pixel structure
Packet transmission system and fault recovery method
Tube lighting fixture
Micromachined devices and fabricating the same
Data security for dynamic random access memory using body bias to clear data at power-up
  Randomly Featured Patents
Semantic analysis system for interpreting linguistic structures output by a natural language linguistic analysis system
Power wheelchair
Running board
Resist compositions
Dielectric filter for filtering out unwanted higher order frequency harmonics and improving skirt response
LED unit and illumination apparatus using same
Method for rejuvenating catalysts in hydrodesulfurization of hydrocarbon feedstock
Golf "swing for accuracy" mat
Data display terminal having data storage and transfer apparatus employing matrix notation addressing
Automatic fine tuning circuit