Layout data creation device for creating layout data of pillar-type transistor
AssigneeElpida Memory, Inc.
InventorsShinji KATO, Kazuteru Ishizuka, Kiyotaka Endo, Mitsuki Koda
Life of this patent
Estimating the term…
Abstract
A layout data creation device includes a transistor adjustment unit. The transistor adjustment unit divides a pillar-type transistor including a plurality of unit pillar-type transistors into the unit pillar-type transistors groups. The unit pillar-type transistors can be placed in a placement area. The number of the unit pillar-type transistors in each group is an integer. The transistor adjustment unit generates sub-pillar-type transistors that are placed in the placement area.
Claims9
A layout data creation device comprising a transistor adjustment unit that divides a pillar-type transistor into a plurality of sub-pillar-type transistors each of which includes one or more unit pillar-type transistors having the same configuration as one another, the transistor adjustment unit arranging the sub-pillar-type transistors in a predetermined area defined in an integrated circuit.
A semiconductor device comprising a pillar-type transistor including a plurality of sub-pillar-type transistors arranged in a predetermined area, each of the sub-pillar-type transistors including one or more unit pillar-type transistors arranged in line to a first direction in the predetermined area, each of the sub-pillar-type transistors having a source, a drain and a gate, the sources of the sub-pillar-type transistors being connected in common, the drains of the sub-pillar-type transistors being connected in common, and the gates of the sub-pillar-type transistors being connected in common.
A method of designing a pillar-type transistor including a plurality of unit pillar-type transistors connected to parallel, the method comprising:
- obtaining a first number of the unit pillar-type transistors constituting the pillar-type transistor;
- obtaining a second number of the unit pillar-type transistors that can be arranged in a first direction of a predetermined layout area;
- obtaining a third number by dividing the first number by the second number with rounding up;
- obtaining a fourth number by multiplying the second number by the third number;
- obtaining a fifth number by subtracting the first number from the fourth number;
- obtaining a sixth number by dividing the fifth number by the third number;
- decreasing the second number if the sixth number is equal to or more than 1;
- and
- arranging the unit pillar-type transistors in the predetermined layout area based on the second and third number.
Dependencies are inferred from the claim text.