Patent ID: 7389483

Claim:
A method for automatically enlarging a width of a bend portion, for enlarging the width of the bend portion of a circuit line in a circuit layout from an original width to an intended width, wherein two terminals of a center line of the bend portion respectively are a first turn point and a second turn point of the circuit line, the method comprising: performing a calculation based on the original width, the intended width, coordinates of the first turn point and the second turn point, to obtain a plurality of coordinates of corner-points of a polygon, wherein a width of the polygon is the intended width; and the step of performing the calculation comprises: respectively selecting one point in each of two circuits coupled to the two terminals of the bend portion to respectively set as a first determination point or a second determination point, wherein the bend portion in the circuit layout is 45 degree bend portion; and determining a calculation formula and obtaining the coordinates of the corner-points of the polygon, according to the first determination point, the second determination point, the first turn point and the second turn point, wherein calculation and obtaining the coordinates of the corner-points of the polygon include following an equation to get a coordinate difference delta by delta=[(0.707 W bend −0.499 W normal )/RES+1]*RES, wherein W bend represents the intended width, W normal represents the original width, RES represents a resolution of the circuit layout, adding the polygon into the original layout, overlapping with the bend portion, wherein the polygon, the bend portion, and the whole circuit line are in the same layer.