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










Image Number 9 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
Packaging for socks
Sericin cationic nanoparticles for application in products for hair and dyed hair
Crowd control barrier II
Treatment of celiac disease with IgA
Image forming apparatus having a primary transfer unit, a secondary transfer unit, and a direct transfer unit
Encoding and/or decoding memory devices and methods thereof
Listing recommendation using generation of a user-specific query in a network-based commerce system
  Randomly Featured Patents
Laminated tablet with pointed core
Vehicle user distance measuring system
Plant tray
Lithium ion fast pulse charger
Binocular telescope with coupled joint focusing and uncoupled separate focusing
Thermal transfer ribbon mechanism and recording method
Combined power and telephone wall plate
Fireplace sound system
Spoon
Electronic calculator