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Vivek Singh Vivek Singh Intel Fellow Intel Fellow Director, Computational Lithography Director, Computational Lithography Technology Manufacturing Group Technology Manufacturing Group Litho and Design: Litho and Design: Litho and Design: Litho and Design: Litho and Design: Litho and Design: Litho and Design: Litho and Design: Moore Close Than Moore Close Than Moore Close Than Moore Close Than Moore Close Than Moore Close Than Moore Close Than Moore Close Than Ever Ever Ever Ever Ever Ever Ever Ever Technology Manufacturing Group Technology Manufacturing Group Intel Corporation Intel Corporation ISPD , March 2011

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Page 1: Litho and Design: Moore Close Than EverMoore Close Than Everispd.cc/slides/2011/8.2_Singh.pdf · PILOT LINE $1-2 B R&D PROCESS TEAM $0.5-1 B Source: Intel The ... OPC model Illumination

Vivek SinghVivek SinghIntel FellowIntel Fellow

Director, Computational LithographyDirector, Computational Lithography

Technology Manufacturing GroupTechnology Manufacturing Group

Litho and Design: Litho and Design: Litho and Design: Litho and Design: Litho and Design: Litho and Design: Litho and Design: Litho and Design: Moore Close Than Moore Close Than Moore Close Than Moore Close Than Moore Close Than Moore Close Than Moore Close Than Moore Close Than EverEverEverEverEverEverEverEver

Technology Manufacturing GroupTechnology Manufacturing Group

Intel CorporationIntel Corporation

ISPD , March 2011

Page 2: Litho and Design: Moore Close Than EverMoore Close Than Everispd.cc/slides/2011/8.2_Singh.pdf · PILOT LINE $1-2 B R&D PROCESS TEAM $0.5-1 B Source: Intel The ... OPC model Illumination

Gasp!Gasp!

22V. Singh, ISPD , March 2011

Page 3: Litho and Design: Moore Close Than EverMoore Close Than Everispd.cc/slides/2011/8.2_Singh.pdf · PILOT LINE $1-2 B R&D PROCESS TEAM $0.5-1 B Source: Intel The ... OPC model Illumination

OutlineOutline

�� The frenetic pace of Moore’s Law, The frenetic pace of Moore’s Law,

and why we put up with it!and why we put up with it!

��How the coHow the co--optimization of design and optimization of design and

lithography have enabled Moorelithography have enabled Moore

33V. Singh, ISPD , March 2011

lithography have enabled Moorelithography have enabled Moore

��How computational lithography is How computational lithography is

squeezing more juice out of stepperssqueezing more juice out of steppers

Page 4: Litho and Design: Moore Close Than EverMoore Close Than Everispd.cc/slides/2011/8.2_Singh.pdf · PILOT LINE $1-2 B R&D PROCESS TEAM $0.5-1 B Source: Intel The ... OPC model Illumination

The Economics of Moore’s LawThe Economics of Moore’s Law

TheBenefit:

101010101010101055

101010101010101066

101010101010101077

101010101010101088

101010101010101099

10101010101010101010

As the number As the number of transistors of transistors

goesgoes UP

Price per Price per transistor goestransistor goes

DOWN

1010101010101010

1010101010101010--------55

1010101010101010--------44

1010101010101010--------33

1010101010101010--------22

1010101010101010--------11

101010101010101000

$$

44V. Singh, ISPD , March 2011

Source: Source: WSTS/Gartner/IntelWSTS/Gartner/Intel

FAB $4 B

PILOT LINE $1-2 B

R&D PROCESS TEAM $0.5-1 BSource:

Intel

TheCost:

Investment & co-optimized execution required to maximize the benefit

101010101010101033

101010101010101044

’70’70 ’80’80 ’90’90 ’00’00

1010101010101010--------66

1010101010101010

1010101010101010--------77

Page 5: Litho and Design: Moore Close Than EverMoore Close Than Everispd.cc/slides/2011/8.2_Singh.pdf · PILOT LINE $1-2 B R&D PROCESS TEAM $0.5-1 B Source: Intel The ... OPC model Illumination

Intel’s Silicon R&D PipelineIntel’s Silicon R&D Pipeline

15 15 nmnm 22 22 nmnm 32 32 nmnm 45 45 nmnm

55V. Singh, ISPD , March 2011

Continuous flow of new technologies from

research to development to manufacturing

Pathfinding Development ManufacturingResearch

Page 6: Litho and Design: Moore Close Than EverMoore Close Than Everispd.cc/slides/2011/8.2_Singh.pdf · PILOT LINE $1-2 B R&D PROCESS TEAM $0.5-1 B Source: Intel The ... OPC model Illumination

OnOn--time 2 Year Cyclestime 2 Year Cycles

32 nm2009

90 nm2003

45 nm2007

The image cannot be displayed. Your computer may not have enough memory to open the image, or the image may have been corrupted. Restart your computer, and then open the file again. If the red x still appears, you may have to delete the image and then insert it again.

65 nm2005

22 nm2011

66V. Singh, ISPD , March 2011

InIndevelopmentdevelopment

Page 7: Litho and Design: Moore Close Than EverMoore Close Than Everispd.cc/slides/2011/8.2_Singh.pdf · PILOT LINE $1-2 B R&D PROCESS TEAM $0.5-1 B Source: Intel The ... OPC model Illumination

Defect Density TrendsDefect Density Trends

Defect Density

(Log Scale)

90nm 65nm 45nm 32nm

HigherYield

77V. Singh, ISPD , March 2011

2001 2002 2003 2004 2005 2006 2007 2008 2009

Continuing to improve wafer defect density is crucial to achieving historical yield trends

Page 8: Litho and Design: Moore Close Than EverMoore Close Than Everispd.cc/slides/2011/8.2_Singh.pdf · PILOT LINE $1-2 B R&D PROCESS TEAM $0.5-1 B Source: Intel The ... OPC model Illumination

Breakthroughs in Technology Information Breakthroughs in Technology Information TurnsTurns

Info

rmat

ion T

urn

s

90nm

65nm

45nm

32nm

88V. Singh, ISPD , March 2011

Info

rmat

ion T

urn

s

20022001 2003 2004 2005 2006 2007 2008

1.7 X improvement in Information turns Faster information back to process development and design teams

Page 9: Litho and Design: Moore Close Than EverMoore Close Than Everispd.cc/slides/2011/8.2_Singh.pdf · PILOT LINE $1-2 B R&D PROCESS TEAM $0.5-1 B Source: Intel The ... OPC model Illumination

SRAM Cell Size ScalingSRAM Cell Size Scaling

1

10C

ell A

rea

(um

2 )

65 nm, 0.570 um2

99V. Singh, ISPD , March 2011

0.01

0.1

1995 2000 2005 2010 2015

Cel

l Are

a (u

m

0.5x every 2 years

32 nm, 0.171 um 2

45 nm, 0.346 um 2

22 nm, 0.092 um 2

All Patterned with 193nm!!

Page 10: Litho and Design: Moore Close Than EverMoore Close Than Everispd.cc/slides/2011/8.2_Singh.pdf · PILOT LINE $1-2 B R&D PROCESS TEAM $0.5-1 B Source: Intel The ... OPC model Illumination

TickTick--tock: an example from Intel of process tock: an example from Intel of process and design marching in cadenceand design marching in cadence

2 YEARS

2 YEARS

TOCK Core 2 processor, Xeon processor

TICK Pentium® D, Xeon™, Core™ processor

2 YEARS

2 YEARS

45nm

TICK PENRYN Family

65nm

1010V. Singh, ISPD , March 2011

2 YEARS

2 YEARS

2 YEARS

2 YEARS

TOCK NEHALEM

TOCK SANDY BRIDGE

32nm

TICK WESTMERE

45nm

All product information and dates are preliminary and subject to change without notice

Page 11: Litho and Design: Moore Close Than EverMoore Close Than Everispd.cc/slides/2011/8.2_Singh.pdf · PILOT LINE $1-2 B R&D PROCESS TEAM $0.5-1 B Source: Intel The ... OPC model Illumination

Design Rule Definition Process:Design Rule Definition Process:How Litho and Design are connectedHow Litho and Design are connected

DR Modeling

And Process evaluation

DOF, MEEF, etc

1 D Pitch target set by density goals

Learning from previous process

extrapolated OPC model

Illumination techniques

OPC/litho test masks

Modify older test chip

1111V. Singh, ISPD , March 2011

DOF, MEEF, etc

Design rules

Photo resist evaluation

techniques

Enhancement techniques

X test chip

Layout

studies

Product Evaluation

CAD

tools

C. Webb, SPIE 2007

Page 12: Litho and Design: Moore Close Than EverMoore Close Than Everispd.cc/slides/2011/8.2_Singh.pdf · PILOT LINE $1-2 B R&D PROCESS TEAM $0.5-1 B Source: Intel The ... OPC model Illumination

Rule StabilityRule Stability

60.00%

80.00%

100.00%

120.00%

Growth

in

Number

X Chip Tape out

1212V. Singh, ISPD , March 2011

0.00%

20.00%

40.00%

0

Relative Year

Number

of

Rules

-1-2

First Design Debug Ramp

Process Development

+1 +2

C. Webb, SPIE 2007

Page 13: Litho and Design: Moore Close Than EverMoore Close Than Everispd.cc/slides/2011/8.2_Singh.pdf · PILOT LINE $1-2 B R&D PROCESS TEAM $0.5-1 B Source: Intel The ... OPC model Illumination

130nm 130nm

1313V. Singh, ISPD , March 2011

�� Variable poly pitch and line widths Variable poly pitch and line widths

�� X and Y transistor orientation X and Y transistor orientation

�� Design rule definition was primarily done through simple Design rule definition was primarily done through simple scaling of rules from previous generationscaling of rules from previous generation

�� Limited modeling of layout and design rulesLimited modeling of layout and design rules

SRAM Bit

C. Webb, SPIE 2007

Page 14: Litho and Design: Moore Close Than EverMoore Close Than Everispd.cc/slides/2011/8.2_Singh.pdf · PILOT LINE $1-2 B R&D PROCESS TEAM $0.5-1 B Source: Intel The ... OPC model Illumination

90nm 90nm 47% increase in number of poly rules47% increase in number of poly rules

1414V. Singh, ISPD , March 2011

�� All Devices in one orientation except SRAMAll Devices in one orientation except SRAM

�� Complex rules did not impact transistor densityComplex rules did not impact transistor density–– Modeling and layout study effort increased from 130nm generationModeling and layout study effort increased from 130nm generation

SRAM Bit

C. Webb, SPIE 2007

Page 15: Litho and Design: Moore Close Than EverMoore Close Than Everispd.cc/slides/2011/8.2_Singh.pdf · PILOT LINE $1-2 B R&D PROCESS TEAM $0.5-1 B Source: Intel The ... OPC model Illumination

65nm65nm65% increase in number of rules65% increase in number of rules

�� All Devices in one orientation including SRAMAll Devices in one orientation including SRAM

�� Rules to enable phase shift masksRules to enable phase shift masks

�� Different rules for minimum pitch, larger poly pitch and poly routingDifferent rules for minimum pitch, larger poly pitch and poly routing

�� Layout more difficult but no significant density impactLayout more difficult but no significant density impact

1515V. Singh, ISPD , March 2011

SRAM

C. Webb, SPIE 2007

Page 16: Litho and Design: Moore Close Than EverMoore Close Than Everispd.cc/slides/2011/8.2_Singh.pdf · PILOT LINE $1-2 B R&D PROCESS TEAM $0.5-1 B Source: Intel The ... OPC model Illumination

Problems Problems with 65nm with 65nm poly layoutpoly layout

Poly corners affecting devices

Two direction routing

1616V. Singh, ISPD , March 2011

Multiple poly widths

Variable poly pitch

Could all logic poly layout be simple like the SRAM bit? C. Webb, SPIE 2007

Page 17: Litho and Design: Moore Close Than EverMoore Close Than Everispd.cc/slides/2011/8.2_Singh.pdf · PILOT LINE $1-2 B R&D PROCESS TEAM $0.5-1 B Source: Intel The ... OPC model Illumination

45nm Logic Layout45nm Logic Layout37% reduction in number of rules37% reduction in number of rules

One direction

Trench contact local routing replaces orthogonal to gate poly

1717V. Singh, ISPD , March 2011

�� No significant density impactNo significant density impact

�� Design had to adapt to limited channel length choices Design had to adapt to limited channel length choices and new layout styleand new layout style

One Pitch with poly on grid

orthogonal to gate poly routing

C. Webb, SPIE 2007

Page 18: Litho and Design: Moore Close Than EverMoore Close Than Everispd.cc/slides/2011/8.2_Singh.pdf · PILOT LINE $1-2 B R&D PROCESS TEAM $0.5-1 B Source: Intel The ... OPC model Illumination

Layout has adapted to litho constraints, without affecting Moore’s march

65 nm Layout Style 32 nm Layout Style

1818V. Singh, ISPD , March 2011

• Bi-directional features

• Varied gate dimensions

• Varied pitches

• Uni-directional features

• Uniform gate dimension

• Gridded layoutM. Bohr, ISCC, 2009

Page 19: Litho and Design: Moore Close Than EverMoore Close Than Everispd.cc/slides/2011/8.2_Singh.pdf · PILOT LINE $1-2 B R&D PROCESS TEAM $0.5-1 B Source: Intel The ... OPC model Illumination

0.346 µm2 Cell 193 nm Dry Lithography0.10.1

11

1010

100100

Cell Area Cell Area

(um(um22))

0.5x every 0.5x every 2 years2 years

What matters is Best Total Cost What matters is Best Total Cost

45nm Cell45nm Cell0.346 um20.346 um2

Density reduction at Density reduction at Lowest cost and TTMLowest cost and TTM

SRAM SRAM -- Functional silicon in Jan ‘06Functional silicon in Jan ‘06SRAM Cell SizeSRAM Cell Size

1919V. Singh, ISPD , March 2011

193 nm Dry Lithography0.10.1

19921992 19941994 19961996 19981998 20002000 20022002 20042004 20062006 20082008

Critical Layer Lithography Cost ComparisonCritical Layer Lithography Cost Comparison45nm Node assuming equal yield45nm Node assuming equal yield

0.90.9

11

1.11.1

1.21.2

1.31.3

193nm Dry193nm Dry 193nm Immersion193nm Immersion

ForecastForecast

Page 20: Litho and Design: Moore Close Than EverMoore Close Than Everispd.cc/slides/2011/8.2_Singh.pdf · PILOT LINE $1-2 B R&D PROCESS TEAM $0.5-1 B Source: Intel The ... OPC model Illumination

MultiMulti--mask patterning mask patterning –– a friend in needa friend in need

�� As wafer dimensions reach optical As wafer dimensions reach optical limits, multilimits, multi--mask patterning came to mask patterning came to rescuerescue

�� Works well for simple repeated Works well for simple repeated patternspatterns

2020V. Singh, ISPD , March 2011

�� Not so well with general patternsNot so well with general patterns

Does not resolve Problem at corners

Overlay issues

Modify design –does it impact performance?

� Need complex design rules to capture multi-mask conflicts

� Design tools need to be multi-mask aware to minimize impact

Page 21: Litho and Design: Moore Close Than EverMoore Close Than Everispd.cc/slides/2011/8.2_Singh.pdf · PILOT LINE $1-2 B R&D PROCESS TEAM $0.5-1 B Source: Intel The ... OPC model Illumination

One implication of Double-patterningMisalignment

Normalized IDSAT

2121V. Singh, ISPD , March 2011

Misalignment between the 2 exposures is a crucial liability for this technique and can limit its usability

Transistor parameters can be affected by asymmetry between the source and drain regions

Print 1 Print 2 Registration (nm) K. Kuhn, ICVC, 2009

Page 22: Litho and Design: Moore Close Than EverMoore Close Than Everispd.cc/slides/2011/8.2_Singh.pdf · PILOT LINE $1-2 B R&D PROCESS TEAM $0.5-1 B Source: Intel The ... OPC model Illumination

Pitch doubling and gate CD matching

A A

B

A

B BB1266

12641262

860

SR

AM

Vcc

min

2222V. Singh, ISPD , March 2011

Pitch doubling eliminates the close correlation which currently exists between the CDs of

adjacent gates

This has implications for memory cells and other circuits which depend upon this CD

matching

Gate CD mismatch σσσσC. Kenyon, TOK conf., Dec. 2008

Page 23: Litho and Design: Moore Close Than EverMoore Close Than Everispd.cc/slides/2011/8.2_Singh.pdf · PILOT LINE $1-2 B R&D PROCESS TEAM $0.5-1 B Source: Intel The ... OPC model Illumination

NGL solutions can help contain rising NGL solutions can help contain rising cost of double patterningcost of double patterning

2323V. Singh, ISPD , March 2011

Source: ITRS 2009

Page 24: Litho and Design: Moore Close Than EverMoore Close Than Everispd.cc/slides/2011/8.2_Singh.pdf · PILOT LINE $1-2 B R&D PROCESS TEAM $0.5-1 B Source: Intel The ... OPC model Illumination

0.1

1

micron 100

1000

nm

193 nm248 nm

LithographyWavelength

65 nmFeature

365 nm

436 nm

Computational lithography Computational lithography –– enabling Mooreenabling Moore

2424V. Singh, ISPD , March 2011

0.011980 1990 2000 2010 2020

10

32 nm45 nmFeature

Size22 nm EUV

13 nm15 nm

Computational lithography innovations and co-optimization with design necessary to

bridge this gap

Page 25: Litho and Design: Moore Close Than EverMoore Close Than Everispd.cc/slides/2011/8.2_Singh.pdf · PILOT LINE $1-2 B R&D PROCESS TEAM $0.5-1 B Source: Intel The ... OPC model Illumination

2D Effects Become Important2D Effects Become Important

2525V. Singh, ISPD , March 2011

Rule-based serif placement were first instance of on-mask pattern manipulation to deliver design intent

S. Sivakumar, SPIE, 2011

Page 26: Litho and Design: Moore Close Than EverMoore Close Than Everispd.cc/slides/2011/8.2_Singh.pdf · PILOT LINE $1-2 B R&D PROCESS TEAM $0.5-1 B Source: Intel The ... OPC model Illumination

One CL product: One CL product: pixelatedpixelated masksmasks

Design Pattern Model black-box

2626V. Singh, ISPD , March 2011

Pixelated maskSEM image of wafer

Atomic Force Microscope Picture of the mask

Page 27: Litho and Design: Moore Close Than EverMoore Close Than Everispd.cc/slides/2011/8.2_Singh.pdf · PILOT LINE $1-2 B R&D PROCESS TEAM $0.5-1 B Source: Intel The ... OPC model Illumination

A FullA Full--Chip View is worth a trillion pixelsChip View is worth a trillion pixels

2727V. Singh, ISPD , March 2011

Note: some cells are not visible due to graphics cullingTop-cell pixels are not displayedOnly 0-deg pixels are displayed

Page 28: Litho and Design: Moore Close Than EverMoore Close Than Everispd.cc/slides/2011/8.2_Singh.pdf · PILOT LINE $1-2 B R&D PROCESS TEAM $0.5-1 B Source: Intel The ... OPC model Illumination

Convert pixelated mask to more Convert pixelated mask to more manufacturablemanufacturable mask, mask, while while preserving preserving

performanceperformancepixelated mask More manufacturable mask

2828V. Singh, ISPD , March 2011

Page 29: Litho and Design: Moore Close Than EverMoore Close Than Everispd.cc/slides/2011/8.2_Singh.pdf · PILOT LINE $1-2 B R&D PROCESS TEAM $0.5-1 B Source: Intel The ... OPC model Illumination

Two pronged approach: Two pronged approach:

simplify simplify inverse masksinverse masksimprove improve mask shop capabilitiesmask shop capabilities

2929V. Singh, ISPD , March 2011

Page 30: Litho and Design: Moore Close Than EverMoore Close Than Everispd.cc/slides/2011/8.2_Singh.pdf · PILOT LINE $1-2 B R&D PROCESS TEAM $0.5-1 B Source: Intel The ... OPC model Illumination

Optimizing Source and MaskOptimizing Source and Mask

Source OptimizationSource Optimization

++

Source Mask OptimizationSource Mask Optimization

3030V. Singh, ISPD , March 2011

Computational Lithography is a key enabler for extracting maximum resolution

from existing technology

Page 31: Litho and Design: Moore Close Than EverMoore Close Than Everispd.cc/slides/2011/8.2_Singh.pdf · PILOT LINE $1-2 B R&D PROCESS TEAM $0.5-1 B Source: Intel The ... OPC model Illumination

Atomic Force Microscope Picture of Pixelated Phase Mask

SEM Picture of 65nm MT1 resist Pattern from Pixelated Phase Mask

Ultimately, the proof is in the pudding. Exotic Ultimately, the proof is in the pudding. Exotic Ultimately, the proof is in the pudding. Exotic Ultimately, the proof is in the pudding. Exotic Ultimately, the proof is in the pudding. Exotic Ultimately, the proof is in the pudding. Exotic Ultimately, the proof is in the pudding. Exotic Ultimately, the proof is in the pudding. Exotic techniques need to be viable for production.techniques need to be viable for production.techniques need to be viable for production.techniques need to be viable for production.techniques need to be viable for production.techniques need to be viable for production.techniques need to be viable for production.techniques need to be viable for production.

3131V. Singh, ISPD , March 2011

Defect free Pixelated Phase Masks produced, Leading 65nm node Microprocessor patterned at MT1 with Pixelated Phase Mask yielded close to manufacturing baseline

Computational lithography is helping extract more resolution from existing technology

Page 32: Litho and Design: Moore Close Than EverMoore Close Than Everispd.cc/slides/2011/8.2_Singh.pdf · PILOT LINE $1-2 B R&D PROCESS TEAM $0.5-1 B Source: Intel The ... OPC model Illumination

Other things being equal, you can measure Other things being equal, you can measure CL innovation through compute costCL innovation through compute cost

Cost savingsfrom CL innovations

?

Rel

ativ

e co

st

10000000

1000000

100000

10000

A new node increases compute cost due to increase i n:� number of OPC layers� density� required computational accuracy� model accuracy needs� convergence difficulty� Number of OPC features

3232V. Singh, ISPD , March 2011

Technology node

Rel

ativ

e co

st

65 45 32 22 15

1

10

10000

1000

100

Page 33: Litho and Design: Moore Close Than EverMoore Close Than Everispd.cc/slides/2011/8.2_Singh.pdf · PILOT LINE $1-2 B R&D PROCESS TEAM $0.5-1 B Source: Intel The ... OPC model Illumination

Future Technology DirectionsFuture Technology Directions

More MooreCMOS

3333V. Singh, ISPD , March 2011

2000 2010 2020 2030

New device technology will be needed by 2020M. Bohr, SPIE, 2011

Page 34: Litho and Design: Moore Close Than EverMoore Close Than Everispd.cc/slides/2011/8.2_Singh.pdf · PILOT LINE $1-2 B R&D PROCESS TEAM $0.5-1 B Source: Intel The ... OPC model Illumination

Future Technology DirectionsFuture Technology Directions

More MooreCMOS

New ApplicationsDigital + analog + optical

Silicon + III-VElectrical + Mechanical

3434V. Singh, ISPD , March 2011

2000 2010 2020 2030

New device technology will be needed by 2020M. Bohr, SPIE, 2011

Page 35: Litho and Design: Moore Close Than EverMoore Close Than Everispd.cc/slides/2011/8.2_Singh.pdf · PILOT LINE $1-2 B R&D PROCESS TEAM $0.5-1 B Source: Intel The ... OPC model Illumination

Future Technology DirectionsFuture Technology Directions

More MooreCMOS

New ApplicationsDigital + analog + optical

Silicon + III-VElectrical + Mechanical

3535V. Singh, ISPD , March 2011

2000 2010 2020 2030

New TechnologiesCarbon Based?

Spintronics?Magnetic Domains?Molecular Switches?

New device technology will be needed by 2020M. Bohr, SPIE, 2011

Page 36: Litho and Design: Moore Close Than EverMoore Close Than Everispd.cc/slides/2011/8.2_Singh.pdf · PILOT LINE $1-2 B R&D PROCESS TEAM $0.5-1 B Source: Intel The ... OPC model Illumination

What What will will be printed?be printed?

3636V. Singh, ISPD , March 2011

Page 37: Litho and Design: Moore Close Than EverMoore Close Than Everispd.cc/slides/2011/8.2_Singh.pdf · PILOT LINE $1-2 B R&D PROCESS TEAM $0.5-1 B Source: Intel The ... OPC model Illumination

3737V. Singh, ISPD , March 2011

Page 38: Litho and Design: Moore Close Than EverMoore Close Than Everispd.cc/slides/2011/8.2_Singh.pdf · PILOT LINE $1-2 B R&D PROCESS TEAM $0.5-1 B Source: Intel The ... OPC model Illumination

ConclusionConclusion

“No exponential is

forever … but we can

delay ‘forever’.”

3838V. Singh, ISPD , March 2011

Gordon MooreISSCC

2003