A method for generating a power distribution network (PDN) is provided. A heterogeneous circuit data is input. A plurality of horizontal power lines and a plurality of vertical power lines are determined according to the heterogeneous circuit data. A PDN model of the heterogeneous circuit is determined according to the horizontal power lines and the vertical power lines. Power consumption value is assigned to a plurality of internal nodes of the PDN model of the heterogeneous circuit. The PDN model of the heterogeneous circuit is adjusted to meet a target voltage drop limitation of the heterogeneous circuit data.
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