| 摘要 |
A layout method of an analog/digital mixed semiconductor integrated circuit of the present invention has the steps of: quantitatively calculating a noise circulation amount with parameters of distances between an analog element, a digital element, and a substrate contact dedicated terminal for the digital element; calculating an optimal layout position of the substrate contact dedicated terminal from a position where the noise circulation amount is smallest; and placing the contact dedicated terminal in the optimal calculated layout position and in the layoutable position.
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