Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Manufacturing method of well region in coms intergrated circuit










Image Number 7 for United States Patent #5114868.

First, N-type channel stoppers are formed in an element formation region of a P-channel MOS transistor and in an element isolation region of the P-channel MOS transistor, of a CMOS transistor. After forming a field oxide film, an N well is formed in the element formation region of the P-channel MOS transistor. In spite of the fact that the dose of ions used for the formation of an N-type channel stopper is smaller than the dose of ions used for the formation of an N well, the surface concentration of the N-type impurity of the N-type channel stopper is higher than that of the N well. The N-type impurity concentration in the portion where the N-type channel stopper and the N well are brought into contact, becomes uniform. The variability in the threshold voltage of the P-channel MOS transistor, the threshold voltage of the P-channel parasitic MOS transistor, the junction breakdown voltage of the P.sup.+ diffused layer and the junction capacitance of the P.sup.+ diffused layer is reduced, so that the device obtained is suited for the submicron process.








 
 
  Recently Added Patents
Electrode composition with enhanced performance characteristics
Transmission terminal, transmission system, transmission method, and recording medium storing transmission control program
Identification wristband
For a given cell in a spreadsheet, evaluating an unlimited number of conditional formatting rules and applying multiple corresponding formats to the cell
Nanocatalysts structure, process for the preparation and use thereof
Image forming apparatus, image forming method, and computer readable medium for identifying target-recording element using detection pattern
Method for building taxonomy of topics and categorizing videos
  Randomly Featured Patents
Remote control apparatus for consumer electronic appliances
Lamp for a vehicle headlight with low-beam function
Safety nut assembly for backstand apparatus
Steam turbine having exhaust enthalpic condition control and related method
Apparatus for collecting, processing, and recycling kitchen scraps
Upright vacuum cleaner with cyclonic airflow
Process for reducing the adherence of oil to siliceous material
Method and apparatus for an electronic equipment rack
System and method for determining and/or transmitting and/or establishing communication with a mobile device user for providing, for example, concessions, tournaments, competitions, matching,
Needle roller bearing