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Cadence Sigrity

Power SI & Optimize PI

Rolf Nick

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FlowCAD

FlowCAD Confidential

2

Sigrity Products Overview

• Power Integrity

– PowerDC

– PowerSI

– OptimizePI

• Power Aware SI

– SPEED2000

– SystemSI

– Broadband SPICE T2B

– PowerSI 3D-FEM

• Package Design/Assesment

– UPD

– XtractIM

• CO-design / Co-analysis

– OrbitIO

– XcitePI

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Power SI: Introduction

• Supports S-parameter model extraction and provides robust frequency domain simulation for entire IC package and PCB designs.

• For signal nets as well as power/ground nets

• Accounts for losses (skin effect, dielectric losses) and non-ideal return paths

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A Virtual Network Analyzer

Power SI

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Correlation with measurement

PDS Simulation

Measurement

Log Scale

Linear Scale

red = vcc

green = ground

Power SI

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Broadband Model Extraction

• S-Parameter extraction

for signal nets as well

as power/ground nets

• Discrete passive

components included

during extraction

• Normal view/Mixed

mode view

• Switch between S, Y

and Z domain

• Export to PSpice

Power SI

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Source-free and driven PDN resonances

PDN Impedance Profile point-n-click probed at cursor location

3D display

2D display

Power SI

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Near and Far field through Postprocessing

•Measurements •Hybrid Analysis Far Fields FCC

Hot Spots

Power SI

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3D FEM Simulation

• Full-wave solver

capability for accurate

analysis of complex 3D

structures

• Tailored to IC packages

and PCB structures

• Adaptive meshing

assures accuracy

combined with fast

simulation time

Power SI 3D FEM

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3D FEM Simulation example

Red = PSI-3DFEM

Blue = 3rd party

•Aqua = PSI-3DFEM

•Yellow = 3rd party

Example: Package core PDN

• Simulation from the Power SI GUI

• Accuracy comparable to other 3D FEM tools

• Greater low frequency stability

• Significantly faster simulation times

Power SI 3D FEM

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Primary Advantages

Market leader and product of

choice of companies where power integrity is essential

Highly accurate modeling of layout structures

Ability to handle general n-terminal component models

Unique capability for ensuring accuracy down to DC (patent pending)

Targeted workflows to streamline operations

Integration with 3D solution

•Frequency domain SI, PI and EMC

Power SI

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Optimize PI: Introduction

• Optimize is a highly automated board and IC Package AC frequency analysis solution.

• Supports pre- and post-layout decap studies and identifies impedance issues.

• Decap implementations are optimized for performance and cost

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Exploring design tradeoffs quickly

VRM Device Device

Device

Device

VRM

U1

• Device/VRM location and mounting layer

• Locations and mounting layers of decaps (top/bottom/under)

• Fanout from decaps

• Stackup and plane separation

• Voids on power and GND plane

Optimize PI

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Optimization results for BOM and placement

Optimize PI

Setup: 10 minutes

Simulation: 1 minute

Decap optimization: 6 minutes

Total pre-layout analysis time: 17 minutes

Optimization Objective:

Number of Decaps

39 decaps

$0.55

1st Optimization

Optimization Objective:

Cost

44 decaps

$0.42

2nd Optimization

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Example

Optimize PI

Before

After

Decaps

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Validation of improved performance at lower cost

Optimize PI

•Optimized Design

•Original Design

In both time and frequency domain

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Visualize Decap loop inductance

Optimize PI

Low Loop Inductance

High Loop Inductance

Low Loop Inductance

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EMIcap Selection and Placement

Optimize PI

Optimizing impedance at all PDN locations

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Primary Advantages

Optimize PI

Automated decap optimization and verification features

Clear presentation of economic benefits from decap optimization

Flexibility in meeting targeted objectives (performance, cost, area …)

Easy-to-use AC analysis environment.

Unique device impedance and EMI resonance checking

Support for early-stage studies and post-post layout verification

Automated positioning of EMI decaps