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February 2017 • The PCB Design Magazine 27 Figure 5: A PowerTree diagram. layout can share the same analysis setup, and the optimized decoupling scheme can be up- dated automatically using PCB design tools. AMM AMM is a utility used to manage all analysis models including SPICE, IBIS, VRM, and sink and thermal parameters based on components. Using the unified AMM data, all components— including ICs and discrete components with the same part number or model name—need only one-time model assignment in the same design, without duplicating each one. The model data can be reused by different designs, thus avoid- ing the manual setup for each design. AMM data can be prepared by manual entry in advance, or extracted from existing designs. Figure 4 shows the AMM model editing and model assignment dialog. PowerTree The PowerTree technology is a visualization tool to view power topologies from schematic or layout data. All component properties—in- cluding the resistance value for a resistor, the voltage property for a power/ground net, and so forth—can be extracted during the schematic or layout stages and used to set up the pre-lay- out simulation using the PowerTree tool. Based on the simulation results, users can determine whether all of the selected components meet the functional specifications before the layout is implemented. AMM is integrated into the PowerTree tool as well, and users can reuse the model data in both pre- and post-layout analysis. Using Pow- erTree topologies for the post-layout analysis, only the relevant power nets/ground nets are selected and enabled, isolating the pertinent A NEW POWER DESIGN METHODOLOGY FOR PCB DESIGNS