Tài liệu Integrated Circuits A Design Perspective pptx

 Understanding, designing, and optimizing digital circuits with respect to different quality metrics: cost, speed, power dissipation, and reliability... 5 © Digital Integrated Circuits

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© Digital Integrated Circuits2nd Introduction

Digital Integrated Circuits

A Design Perspective

Introduction

Jan M Rabaey Anantha Chandrakasan Borivoje Nikolic

July 30, 2002

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What is this book all about?

 Introduction to digital integrated circuits.

CMOS inverters and gates Propagation delay, noise margins, and power dissipation Sequential circuits Arithmetic, interconnect, and memories

Programmable logic arrays Design methodologies.

 What will you learn?

 Understanding, designing, and optimizing digital circuits with respect to different quality metrics:

cost, speed, power dissipation, and reliability

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Digital Integrated Circuits

 Introduction: Issues in digital design

 The CMOS inverter

 Combinational logic structures

 Sequential logic gates

 Design methodologies

 Interconnect: R, L and C

 Timing

 Arithmetic building blocks

 Memories and array structures

future?

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The First Computer

The Babbage Difference Engine (1832)

25,000 parts cost: £17,470

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ENIAC - The first electronic computer (1946)

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The Transistor Revolution

First transistor Bell Labs, 1948

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The First Integrated Circuits

Bipolar logic 1960’s

ECL 3-input Gate Motorola 1966

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Intel Pentium (IV) microprocessor

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Moore’s Law

 In 1965, Gordon Moore noted that the

number of transistors on a chip doubled

every 18 to 24 months

 He made a prediction that

semiconductor technology will double its

effectiveness every 18 months

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Evolution in Complexity

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Moore’s law in Microprocessors

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Die Size Growth

386 286

8086 8085

8080 8008 4004 0.1

1 10 100 1000 10000

486 386

286 8086

8085 8080

8008 4004

0.1 1 10 100

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Power will be a major problem

1.5KW 500W

8086

P6 1

10 100 1000 10000

Rocket Nozzle

Power density too high to keep junctions at low temp

Courtesy, Intel

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Not Only Microprocessors

Digital Cellular Market (Phones Shipped)

1996 1997 1998 1999 2000

Units 48M 86M 162M 260M 435M Baseband Analog

Digital Baseband (DSP + MCU )

Power Management

Small Signal RF Power RF

(data from Texas Instruments)

Cell

Phone

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Challenges in Digital Design

Logic Tr./Chip Tr./Staff Month.

x x x x x x

x

21%/Yr compound Productivity growth rate x

58%/Yr compounded Complexity growth rate

10,000 1,000 100 10 1 0.1 0.01 0.001

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Why Scaling?

 Technology shrinks by 0.7/generation

 With every generation can integrate 2x more

functions per chip; chip cost does not increase significantly

 Cost of a function decreases by 2x

 But …

 Design engineering population does not double every two years…

 Hence, a need for more efficient design methods

 Exploit different levels of abstraction

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Design Abstraction Levels

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Design Metrics

digital circuit (gate, block, …)?

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Cost of Integrated Circuits

 design time and effort, mask generation

 one-time cost factor

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NRE Cost is Increasing

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Cost per Transistor

chips of

number Total

per wafer chips

good of

per wafer Dies

cost

Wafer cost

2

diameter

wafer area

die

diameter/2

wafer per wafer

 is approximately 3

4

area) (die

cost die  f

VM = f(VM)

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Mapping between analog and digital signals

V IH

V OH

UndefinedRegion

“ 1”

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Definition of Noise Margins

Noise margin high

Noise margin low

VIH VIL

Undefined Region

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Noise Budget

expected sources of noise

interference, offset

proportional noise sources

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Key Reliability Properties

 a floating node is more easily disturbed than a node driven by a low impedance (in terms of voltage)

 Noise immunity is the more important metric –

the capability to suppress noise sources

impedance of the driver and input impedance of the receiver;

Simulated response

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Fan-in and Fan-out

N

Fan-out N Fan-in M

M

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The Ideal Gate

R i = 

R o = 0 Fanout = 

NMH = NML = VDD/2

g = 

V in

V out

p T

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Energy and Energy-Delay

E = Energy per operation = Pav  tp

quality metric of gate = E  tp

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Summary

 Digital integrated circuits have come a long

way and still have quite some potential left for the coming decades

 Some interesting challenges ahead

 Getting a clear perspective on the challenges and potential solutions is the purpose of this book

 Understanding the design metrics that govern digital design is crucial

 Cost, reliability, speed, power and energy dissipation