Resources Contact Us Home
Semiconductor device

Image Number 13 for United States Patent #6365925.

A semiconductor device that is easily operated with a single positive voltage supply and exhibits an excellent linearity of mutual conductance and source-gate capacitance with regard to a gate voltage is provided. The semiconductor device comprises a second barrier layer of AlGaAs, a channel layer of InGaAs and a first barrier layer of AlGaAs that are stacked in this order on a substrate of GaAs with a buffer layer of u-GaAs between the substrate and the second barrier layer. Carrier supply regions doped with n-type impurity are formed in part of the first and second barrier layers. A low resistivity region including a high concentration of p-type impurity (Zn) is formed in the first barrier layer. The low resistivity region is buried in a high resistivity region and brought to contact with a gate electrode. Upon an application of positive voltage to the gate electrode, a carrier deficient region disappears in the channel layer and no parasitic resistance component remains.

  Recently Added Patents
Collaborative computing community role mapping system and method
Veronica plant named `Amethyst Plume`
Method and apparatus for encoding and decoding video based on first sub-pixel unit and second sub-pixel unit
Selection of hash lookup keys for efficient retrieval
Method for detecting security error in mobile telecommunications system and device of mobile telecommunications
Pharmaceutical powder compositions
Content protection apparatus and content encryption and decryption apparatus using white-box encryption table
  Randomly Featured Patents
True-time-delay feed network for CTS array
Sector scanning, intracavitary ultrasonic probe
Special service signal tester
Housing for disk drive unit
Gate valve
Thin-shaped television
Solid-state image pickup apparatus capable of reading out image signals while thinning them down horizontally and signal reading method therefor
Methods and systems for improving a maximum operating frequency of an integrated circuit during a route phase
Solid absorber apparatus for a cyclic absorption process
Simple and quick method for determining the nucleotide sequence of a mitochondrial 21S ribosomal RNA gene of yeast belonging to Saccharomyces cerevisiae