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
Geo-coding images
Curved structural part made of composite material and a process for manufacturing such a part
Protective circuit board and battery pack using the same
Automated synchronization of design features in disparate code components using type differencing
Storage apparatus and method including page discard processing for primary and secondary volumes configured as a copy pair
Carbon blacks having low PAH amounts and methods of making same
System and method for reliable packet data transport in a computer network
  Randomly Featured Patents
Power tool with vibration reducing means
Outer covering for the inside panel of a vehicle including a device for accomodating a safety air cushion
Rotary engine
Brake device and motor with speed reducing mechanism
Apparatus and method for automatic monitoring and control of a soldering process
Footwear upper
Sewing machine head end module construction
Press inking system
Compressible plate for flexographic printing, and process for obtaining
Reduced area imaging devices incorporated within surgical instruments