Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Field effect semiconductor device










Image Number 4 for United States Patent #5650642.

A field effect semiconductor device comprises a first channel layer composed of an undoped semiconductor in which electrons mainly drift in low-noise operation and a second channel layer composed of a semiconductor of one conductivity type in which electrons mainly drift in high-power operation, a third channel layer being provided in the second channel layer or on the second channel layer on the opposite side of the first channel layer. The third channel layer is constituted by at least one semiconductor layer of the one conductivity type or undoped having a greater electron affinity than that of the second channel layer and having a smaller forbidden bandgap than that of the second channel layer. In another field effect semiconductor device, an undoped impurity diffusion preventing layer having an electron affinity approximately equal to that of the second channel layer is provided between the first channel layer and the second channel layer.








 
 
  Recently Added Patents
Apparatus and method for information display of portable device
DNA promoters and anthrax vaccines
Organic light emitting display device and method of manufacturing the same
Layout design defect repair based on inverse lithography and traditional optical proximity correction
Exposure method, exposure apparatus, and method for producing device
Signal processing and tiered signal encoding
Methods of establishing virtual circuits and of providing a virtual private network service through a shared network, and provider edge device for such network
  Randomly Featured Patents
Target for a rolled ball
Automatic transmission lockup clutch control apparatus
Apparatus for detecting a change in volumetric integrity of an enclosure
Electrical power assisted steering systems
Image forming apparatus and image density correction device
Process for manufacturing sweetened liquors and derivatives thereof from cellulose-containing vegetable substrates
Method and apparatus for improving fault test coverage for an integrated circuit
Beam reconfiguration method and apparatus for satellite antennas
Support bracket for electrical box
Method of making a window panel with a resin frame