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Skyworks Solutions, Inc. Proprietary Information 1

Custom EMIR Analysis with Voltus-Fiand Third-Party Extraction Flow

Bin Wan, Xingang WangSkyworks Solutions, Inc

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Outline

• Introduction to Voltus-FI• Cadence EMIR flow with Voltus-Fi

• Skyworks tailored EMIR Voltus-Fi flow with third-party extraction tool

• DSPF netlist and DSPF parser

• ADE DSPF Integration• Voltus-Fi EMIR results and layout analysis

• Conclusion

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Introduction to Voltus-Fi

• Transistor-Level Electro-Migration & IR-Drop (EMIR) Analysis• Integrated into Analog Design Environment (ADE)

• Native Detailed Standard Parasitic Format (DSPF) netlist support with“iterated method” in Spectre APS

•

EMIR results visualization in Virtuoso layout editor

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Cadence EMIR Flow with Voltus-Fi

Schematic

Layout

Assura/PVSLVS

QuantusQRC

DSPFNetlist

TestbenchSchematic

Run Spectre APSwith EMIR Optionin ADE

View EMIR Resultsin Virtuoso Layout

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Skyworks tailored Voltus-Fi Flow with ThirdParty Extraction Tools

Schematic

Layout

CalibreLVS

QuantusQRC

DSPFNetlist

TestbenchSchematic

Run Spectre APSwith EMIR Option

in ADE

View EMIR Resultsin Virtuoso Layout

Calibre xRC

QuerySVDB

DSPFParser

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The DSPF Netlist

• DSPF netlist requirement for Voltus-Fi EMIR analysis: – All power and ground nets extracted

– Layer information on each parasitic resistor

– (x,y) coordinates on each parasitic resistor

– Decoupled RC for all signal nets

– Numbers of vias extracted

• SPF Checker utility available to check DSPF format in ADE EMIR setup form

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DSPF Netlist Parser

• Perl script to parse Calibre xRC created DSPF to be Voltus-Ficompatible

• Design kit specific parser

• Main fixes: –

Layer name replacement – Units replacement

– Substrate node conversion

– Via count replacement

– Parameter name addition

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Parser: Layer Name Replacement

•The emDataFile provided by the foundry probably coded with QRC flow

• The metal layer names defined in QRC are probably not the same as in CalibreLVS/xRC – emDataFile: M1

– Calibre DSPF netlist: m1_par

• Several possible solutions:1. Modify Calibre LVS/xRC deck to use QRC layer names

2. Modify emDataFile to use Calibre LVS/xRC layer names3. Use some kind of mapping file

4. replace Calibre $layer=layer_name with QRC layer name

• Use Solution 4 for DSPF parser development – Globally search and replace Calibre layer names with QRC layer names

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Parser: Units Replacement

• By default, QRC extracted DSPF will report width/length of wires in microns

• By default, Calibre xRC extracted DSPF will report width/length in meters

• Both QRC and xRC report the (x,y) coordinates in microns

• Two solutions:1. Look at every $w= and $l=. If value < 1e-3, multiply by 1e6

2. In EMIR setup, set geounit_wl to 1 (default is 1e-6)• Use solution 1 for DSPF parser development

– Multiply all width/length < 1e-3 by 1e6

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Parser: Substrate Node Conversion

•Most RF design kits model passive elements like resistor with the 3rdterminal as substrate

• Some design kits extract devices like resistor with 2 terminals and treat the3rd terminal as a device parameter

• The DSPF parser will parse this parameter to create a proper simulationnetlist – Parsed netlist:

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Parser: Add Parameter Name

•For some design kits, Calibre extracted DSPF doesn’t put the parametername for the extracted parameter – Typically it is for passive device value parameter

• r=600

• c=500f

• Will cause simulations to crash if just a number was passed in

• DSPF Parser will need to add a parameter name such as r= or c= before theparameter value to the netlist

• Original netlist

• Parsed netlist

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Parser: Via Count Replacement

•Voltus-Fi requires number of vias extracted in DSPF netlist for via EMchecks

• QRC extracts vias and reports via count with $N parameter

•

However, Calibre xRC doesn’t use $N but use $count

• Parser will globally replace $count with $N, for valid vias layers

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Summary of DSPF Parser for Calibre

•

Layer name replacement – Due to layer name differences in Calibre LVS/xRC deck andemDataFile

• Units replacement –

Microns vs. meters• Substrate node conversion

– Some design kits use external script to create the substrate node inextracted view

• Add Parameter name – In some design kits, Calibre extracts the device value without a

parameter name

• Via count replacement

– $N vs. $count

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Including DSPF in ADE

•DSPF must be included in ADE Setup -> Simulation Files

• Custom form created to parse DSPF and include it in ADE Simulation Files – Also sets simulator to APS

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Setting up EMIR Analysis

•In ADE, click Setup -> EMIRAnalysis

• Use the select button and selectthe DUT on schematic

• Check the analysis desired, andclick Add

• Make sure the enable buttonbelow is checked

• Click OK

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The DSPF Checker

•Useful tool to check DSPF syntax

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EMIR Report

•EMIR Report is a text-based report of all the nets

• Search for the word “fail+”

• Report contains – Current in the net

– Layer/via name, width, length

– Current density

– Current density limit

– Needed width/vias

– XY location

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EMIR Layout Analysis

•

Layout Analysis provides a graphical way to overlay the EMIR results ontothe layout

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EMIR Layout Visualization

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Conclusion

•

Develop an accurate sign-off EMIR flow based on Voltus-Fi – Tailored Skyworks EMIR flow with third-party LVS and extractionflow

• Develop a DSPF parser to create a proper simulated DSPFnetlist – Convert DSPF to be more QRC-like

• Units conversion

• Layer name

• Via count

– Convert DSPF to satisfy design kit models requirements

• Substrate node conversion

• Parameter name addition

• Setup DSPF in ADE

• Run Spectre APS with EMIR enabled

• View EMIR results in layout

CalibreLVS

DSPFNetlist

Run APSwith EMIR

EMIR Results

in Layout

Calibre xRC

DSPFParser

Documents

DIG105