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Sigrity PowerDC technology provides comprehensive DC analysis for today's low voltage, high-current PCB and IC package designs. It is available with integrated thermal analysis to enable electrical and thermal co-simulation. Using PowerDC, you can assess critical end-to-end voltage margins for every device to ensure reliable power delivery. PowerDC quickly identifies areas of excess current density and thermal hotspots to minimize the risk of field failure in your design.
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PowerDC User Guide
Product Version Sigrity 2023.1
May 2023
© 2023 Cadence Design Systems, Inc. All rights reserved worldwide.
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PowerDC User Guide
May 2023 3 Product Version Sigrity 2023.1
© 2023 All rights reserved worldwide.
1
Launching PowerDC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
PoweDC Workflows . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Using the Editor Pane . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Workflow Tasks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Loading a New/Different Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Loading Components from an Exiting Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Reusing the SPD File Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Checking Stackup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Setting up the Via Plating Thickness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Editing a Backdrill . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Setting up P/G Nets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Generating VRMs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Generating a VRM Automatically . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Generating a VRM Manually . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Connecting the VRM with the Layout Nodes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Generating a VRM Using the Component Manager . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Setting up VRMs from OpimizePI/PowerSI Ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Editing the VRMs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Modifying the Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Unlinking Layout Nodes from Pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Linking Layout Nodes with Pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Selecting a VRM Pin in the VRM Editor Pane . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Selecting a Group of Layout Nodes in the Layer View Window . . . . . . . . . . . . . . . . . 44
Unlinking Pins from a VRM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Connecting VRM Sense Pins to Internal Circuit Node . . . . . . . . . . . . . . . . . . . . . . . . 44
Cross-Board Sense Pin Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Linking the VRM Sense Pin as a Circuit Node . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Linking the VRM Sense Pin as a Physical Node . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Unlinking the VRM Sense Pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Setting Up the VRM Internal Pin Resistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Contents
PowerDC User Guide
May 2023 4 Product Version Sigrity 2023.1
© 2023 All rights reserved worldwide.
Setting up Multi-Phase VRMs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Overview of Sinks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Creating Sinks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Creating Sinks Manually . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Creating Sinks Automatically . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Importing Sink Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Specifying the Total Current in Percentage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Current Mapping File . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
Exporting the Sink Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
Current Mapping File Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
Combining Sinks Sharing the Same Ground . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
Total Current Value . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
Auto Add Multiple Nodes for Pads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
Search by Distance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
Shortcut Menu for DC-DC Creation in PowerDC . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
DC-DC/LDO Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
Adding a DC-DC/LDO Component . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
Editing a DC-DC/LDO Component . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
Input Sink Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
Output VRM Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
Set up Discretes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
Adding Auto Add Discretes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
Disabling Discretes Between Power and Ground Nets . . . . . . . . . . . . . . . . . . . . . . . 79
Setting up V/I Probes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
Setting up Current(I) Probe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
Constraints Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
Constraint Mode Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
Adding the Via Current/Current Density . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
Adding the Plane Current Density . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
Setting T-Constraints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
Plane Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
Lead Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
Modeling Finite Size Component Pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
Voltage Drop Analysis Result . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
Viewing Voltage Distributions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
Saving Simulation Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
PowerDC User Guide
May 2023 5 Product Version Sigrity 2023.1
© 2023 All rights reserved worldwide.
Voltage Distribution Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
Modifying the Color Bar Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98
Viewing the Current Density Distribution Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
Distribution Pane . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
Modifying the Upper Portion of the Distribution pane . . . . . . . . . . . . . . . . . . . . . . . . 101
Modifying the Lower Portion of the Distribution pane . . . . . . . . . . . . . . . . . . . . . . . . 102
Resistance Analysis Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
Resistance Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103
Creating Resistance Automatically . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103
Creating Resistance Manually . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104
Setting up the Equivalent Resistance Network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104
Creating Terminals by Using Model Pins at Selected Circuit Locations . . . . . . . . . . 107
Creating Terminals by Using Model Pins at VRM/SINK Locations . . . . . . . . . . . . . 108
Creating Terminals Manually . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108
Removing Large Resistances from Extracted Model . . . . . . . . . . . . . . . . . . . . . . . . 112
Parameter Sweeping Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113
Choosing Parameter Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114
Choosing Sweeping Sets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115
Defining Parameter Values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116
Generating the Value by Tolerance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117
Generating the Value by Starting/Ending/Steps . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117
Viewing the Parameter Sweeping Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118
Hotkeys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121
Batch Processing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122
Shape Processing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 124
Translator Preferences . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126
Setting the Multiple CPU Usage and Process Priority . . . . . . . . . . . . . . . . . . . . . . . . . . 127
The Mesh Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129
Maximum Mesh Edge Length . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130
3D Via Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130
Performing the Adaptive Meshing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130
Accuracy Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131
Setting up Accuracy Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131
DC Analysis with PowerTree . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 134
Setting Up Using a PowerTree Template . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 134
Creating a New PowerTree . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136
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