Patent ID: 6735558
Filing Date: 2004-05-11
Classification: G06F

Abstract:
A characteristic extraction device extracting a parameter expressing a velocity saturation effect of a MOS transistor, comprising:(a) an effective channel length extraction part receiving a signal expressing measured data of a characteristic of said MOS transistor and extracting an effective channel length of said MOS transistor for at least two drain-to-source voltages on the basis of said signal; and (b) a parameter calculation part calculating said parameter on the basis of extracted said effective channel length and outputting a signal expressing its value, wherein said parameter calculation part (b) includes: (b-1) a U1 calculation part calculating a velocity saturation coefficient U1 as said parameter expressing said velocity saturation effect by regarding said effective channel length as a function Le(Vds) of said drain-to-source voltages Vds and assuming the following relation with another parameter Leff: Le(Vds)=Leff+U1Â·Vds, wherein said at least two drain-to-source voltages are two drain-to-source voltages Vds1 and Vds2, and said U1 calculation part (b-1) includes: (b-1-1) a device part expressing a set of values Le(Vds1) and Le(Vds2) of said function calculated by using said relation for said two drain-to-source voltages Vds1 and Vds2, as a data point on a graph of at least two MOS transistors, (b-1-2) a device part expressing a group of said data points in a straight line on said graph, and (b-1-3) a device part obtaining said velocity saturation coefficient U1 by dividing said value Le(Vds2) at said value Le(Vds1) being about zero on said straight line by the difference Vds2âˆ’Vds1 between said voltage Vds1 and said voltage Vds2.