Resources Contact Us Home
Semiconductor device

Image Number 3 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
Methods and apparatus for determining a phase error in signals
Analysis, secure access to, and transmission of array images
Method for driving electrophoretic display device, electrophoretic display device, and electronic device
Integrated circuit with electromagnetic intrachip communication and methods for use therewith
Production of battery grade materials via an oxalate method
Techniques for forming a contact to a buried diffusion layer in a semiconductor memory device
Image processing system and method
  Randomly Featured Patents
Ready to use campfire
Method for enhancing or inhibiting insulin-like growth factor-I
Infinite refractive index gradient (IRIG) polymers for ocular implant and contact lens applications
Cable connection system for underwater vehicle
Introducing revenue-generating features
Method, system and module for monitoring a power generating system
Multi-stage electronic motion image capture and processing system
Ink jet break-off length measurement apparatus and method
Snap closing panel holder
Multi-color holograms with white-light illumination