Patent ID: 8250508

Claim:
An analysis and design apparatus for semiconductor device, comprising: a storage portion configured to store structure information indicating a structure of a transistor and measured values of electric characteristics of said transistor, associated with each other; a parameter setting portion configured to divide a first channel region of a first transistor into a first plurality of regions, and temporarily set a first plurality of impurity concentrations for said first plurality of regions, respectively, as a first plurality of parameters; an element characteristic calculation portion configured to calculate a first plurality of effective impurity concentrations in said first plurality of regions, respectively, based on said first plurality of parameters by reducing impurity concentrations in first vicinity regions in both ends of said first channel region, calculate a first surface potential by solving a Poisson equation using said first plurality of effective impurity concentrations, and calculate first calculated values of electric characteristics of said first transistor using said first surface potential; and a determination portion configured to compare said first calculated values with first measured values read from said storage portion based on a first structure information indicating a structure of said first transistor, determine said first plurality of parameters for said first transistor when said first measured values correspond to said first calculated values, and store said first structure information and said first plurality of parameters associated with each other in said storage portion, wherein said parameter setting portion, said element characteristic calculation portion and said determination portion are operated until said first measured values correspond to said first calculated values.