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
Molten alloy solidification analyzing method and solidification analyzing program for performing the same
Account and customer creation in an on-line banking model
Method of forming an isolation structure
Bi-directional, compact, multi-path and free space channel replicator
Optical power measurement method, optical line terminal and optical network unit
Multi-channel memory system including error correction decoder architecture with efficient area utilization
Dual source mass spectrometry system
  Randomly Featured Patents
Method of dynamic temperature control during microcrystalline SI growth
Multiple resonance filter
Paging receiver capable of reporting the time of paging connection
Tea strainer
Method of operating a gas sealing valve and valve equipped plastic processing installation
Electromagnetic servo drive for power steering
Exposure control device of shutter for camera
Method for selecting a wireless communication service provider in a multi-service provider environment
Electronic calculator
Process for the production of mutually electrically insulated monocrystalline silicon islands using laser recrystallization