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
Controller for internal combustion engine
Authentication platform and related method of operation
Managing a packet service call within mobile communications user equipment
Highly detectable pilot structure
Hard disk drives having different rotational speeds
Writing implement
Dye-sensitized solar cell, dye-sensitized solar cell module, and coating liquid for forming electrolyte layer
  Randomly Featured Patents
Audio reproducing system
Substituted pyrazoles, compositions containing such compounds and methods of use
Three dimensional chess game
Extended canister fly-through cover
Pollution control device
Carton and blank therefor
Monoclonal antibodies and detection methods for enzymes that confer resistance to 2,4-dichlorophenoxyacetic acid
Composition comprising ethylene copolymer
Gallery picture frame
Methods and apparatus for address translation from an external device to a memory of a processor