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
Digital photographing device, method of controlling the digital photographing device, and computer-readable storage medium for determining photographing settings based on image object motion
Apparatus and method for antenna matching in mobile device
Tile rebate cutting apparatus
Asymmetric signal routing in a programmable logic device
Measurement of thin-layered structures in X-ray computer tomography
Scan testing of integrated circuits and on-chip modules
Circuits and methods for signal transfer between different clock domains
  Randomly Featured Patents
Pocket driving game box
Semiconductor memory device having on die thermal sensor
Inkable sheet
Method for measuring formation properties with a time-limited formation test
Process for the treatment of an aqueous solution mainly containing nitric acid and hydrofluoric acid
Arrangement for improving the drying performance of an automatic dishwasher
Low-profile surface mount filter
Apparatus for extraction of articles frozen in moulds in a freezing machine
Plastic bag making apparatus
Hair band