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Transcript of Device-Specific Power Delivery Network (PDN) Tool .and a maximum 2 A current draw, 50% of which is

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UG-01064-1.1

User Guide

Device-Specific Power Delivery Network (PDN) Tool

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Device-Specific Power Delivery Network (PDN) Tool User Guide

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Device-Specific Power Delivery Network (PDN) Tool User Guide September 2012 Altera Corporation

2012 Altera Corporation. All rights reserved. ALTERA, ARRIA, CYCLONE, HARDCOPY, MAX, MEGACORE, NIOS, QUARTUS and STRATIX are Reg. U.S. Pat.& Tm. Off. and/or trademarks of Altera Corporation in the U.S. and other countries. All other trademarks and service marks are the property of their respectiveholders as described at www.altera.com/common/legal.html. Altera warrants performance of its semiconductor products to current specifications in accordancewith Alteras standard warranty, but reserves the right to make changes to any products and services at any time without notice. Altera assumes no responsibility orliability arising out of the application or use of any information, product, or service described herein except as expressly agreed to in writing by Altera. Alteracustomers are advised to obtain the latest version of device specifications before relying on any published information and before placing orders for products orservices.

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September 2012 Altera Corporation

Contents

Chapter 1. User Guide for the Device-Specific Power Delivery Network (PDN) ToolOverview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11Application of the Tool . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11PDN Decoupling Methodology Review . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

PDN Circuit Topology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12ZTARGET . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12FEFFECTIVE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Major Tabs of the PDN Tool . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15BGA Via . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16Plane Cap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17Cap Mount . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18X2Y Mount . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19Library . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110

Two-Terminal Decoupling Capacitors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111Bulk Capacitors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111X2Y Decoupling Capacitors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111BGA Via and Plane Capacitance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111VRM Library . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111Spreading R, L Parasitics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111Dielectric Material Library . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112

Decap Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113Device/Power Rail Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114Component Parameters Setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114Electric Parameters and Design Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115Decoupling Capacitor (High/Mid Frequency) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115Decoupling Capacitor (Bulk) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115ZEFF Plot . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116

BOM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117Design PCB Decoupling Using the PDN Tool . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118

Pre-Layout Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118Derive Decoupling in a Single-Rail Scenario . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119Derive Decoupling in the Power-Sharing Scenarios . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122

Additional InformationDocument Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Info1How to Contact Altera . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Info1Typographic Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Info1

Device-Specific Power Delivery Network (PDN) Tool User Guide
iv Contents

Device-Specific Power Delivery Network (PDN) Tool User Guide September 2012 Altera Corporation
September 2012 Altera Corporation

1. User Guide for the Device-SpecificPower Delivery Network (PDN) Tool

This user guide provides a brief overview of the various tabs in the device-specific PDN tool. You can quickly and accurately design a robust power delivery network by calculating an optimum number of capacitors that meet the target impedance requirements for a given power supply.

OverviewPCB designers must estimate the number, value, and type of decoupling capacitors needed to develop an efficient PCB decoupling strategy during the early design phase, without going through extensive pre-layout simulations. Alteras Power Delivery Network (PDN) tool provides these critical pieces of information.

Because all device-specific PDN tools have a similar user interface, this document serves as the user guide to all Altera device-specific PDN tools. The device family being supported by the tool is shown on the top-right corner of the major tabs of the tool.

f For more information about Alteras general purpose PDN tool with no device support, refer to the Power Delivery Network (PDN) Tool User Guide.

The PDN tool is a Microsoft Excel-based spreadsheet tool used to calculate an impedance profile based on user inputs. For a given power supply, the spreadsheet requires only basic design information, such as the board stackup, transient current information, and ripple specifications to calculate the impedance profile and the optimum number of capacitors to meet the desired impedance target (ZTARGET). The tool also provides device- and power rail-specific PCB decoupling cut-off frequency (FEFFECTIVE). The results obtained through the spreadsheet tool are intended only as a preliminary estimate and not as a specification. For an accurate impedance profile, Altera recommends a post-layout simulation approach using any of the available EDA tools, such as Sigrity PowerSI, Ansoft SIWave, Cadence Allegro PCB PI, etc.

Application of the ToolThe purpose of the PDN tool is to help the design of a robust power delivery network for the device in the targeted device family by determining an optimum number, type, and value of decoupling capacitors needed for selected device/power rail to meet the desired ZTARGET up to FEFFECTIVE. This spreadsheet tool is useful for exploring the various what-if scenarios during the early design phase, without extensive and time consuming pre-layout analysis.

PDN Decoupling Methodology ReviewThis section describes general PCB decoupling methodology and explains in detail the two parameters (ZTARGET and FEFFECTIVE) provided by the PDN tool for guiding PCB decoupling design.

Device-Specific Power Delivery Network (PDN) Tool User Guide

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12 Chapter 1: User Guide for the Device-Specific Power Delivery Netwo