Digital Integrated Circuits A Design Perspective. Jan M. Rabaey

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1 Digital Integrated Circuits A Design Perspective Jan M. Rabaey

2 Outline (approximate) Introduction and Motivation The VLSI Design Process Details of the MOS Transistor Device Fabrication Design Rules CMOS circuits VLSI Structures System Timing Real Circuits and Performance

3 The First Computer The Babbage Difference Engine (1832) 25,000 parts cost: 17,470 Digital Integrated Circuits Introduction Prentice Hall 1995

4 ENIAC - The first electronic computer (1946) Digital Integrated Circuits Introduction Prentice Hall 1995

5 Evolution in Complexity Digital Integrated Circuits Introduction Prentice Hall 1995

6 What is CMOS VLSI? MOS = Metal Oxide Semiconductor (This used to mean a Metal gate over Oxide insulation) Now we use polycrystalline silicon which is deposited on the surface of the chip as a gate. We call this poly or just red stuff to distinguish it from the body of the chip, the substrate, which is a single crystal of silicon. We do use metal (aluminum) for interconnection wires on the surface of the chip.

7 CMOS:Complementary MOS Means we are using both N-channel and P- channel type enhancement mode Field Effect Transistors (FETs). Field Effect- NO current from the controlling electrode into the output FET is a voltage controlled current device BJT is a current controlled current device N/P Channel - doping of the substrate for increased carriers (electrons or holes)

8 N-Channel Enhancement mode MOS FET Four Terminal Device - substrate bias The self aligned gate - key to CMOS

9 VLSI:Very Large Scale Integration Integration: Integrated Circuits» multiple devices on one substrate How large is Very Large? SSI (small scale integration) 7400 series, transistors MSI (medium scale) series LSI 1,000-10,000 transistors VLSI > 10,000 transistors ULSI/SLSI (some disagreement)

10 Intel 4004 Micro-Processor Digital Integrated Circuits Introduction Prentice Hall 1995

11 Evolution in Transistor Count Digital Integrated Circuits Introduction Prentice Hall 1995

12 Scale Example Consider a chip size of 20mm X 20mm Consider a transistor size of 2um X 2um» With area for wires, etc. 1x10 8 transistors / chip Or - plot at 1 transistor : 1 mm 1 chip : 20 meter x 20 meter plot

13 Intel Pentium (II) microprocessor Digital Integrated Circuits Introduction Prentice Hall 1995

14 VLSI Design But the real issue is that VLSI is about designing systems on chips. The designs are complex, and we need to use structured design techniques and sophisticated design tools to manage the complexity of the design. We also accept the fact that any technology we learn the details of will be out of date soon. We are trying to develop and use techniques that will transcend the technology, but still respect it.

15 The Process of VLSI Design: Consists of many different representations/abstractions of the system (chip) that is being designed. System Level Design Architecture / Algorithm Level Design Digital System Level Design Logical Level Design Electrical Level Design Layout Level Design Semiconductor Level Design (possibly more) Each abstraction/view is itself a Design Hierarchy of refinements which decompose the design.

16 Design Abstraction Levels SYSTEM + MODULE GATE CIRCUIT S n+ G DEVICE D n+ Digital Integrated Circuits Introduction Prentice Hall 1995

17 Help from Computer Aided Design tools Tools» Editors» Simulators» Libraries» Module Synthesis» Place/Route» Chip Assemblers» Silicon Compilers Experts» Logic design» Electronic/circuit design» Device physics» Artwork» Applications - system design» Architectures

18 New Design Methodologies Methodologies which are based on:» System Level Abstractions v.s. Device Characteristic Abstractions Logic structures and circuitry change slowly over time trade-offs do change, but the choices do not» Scalable Designs Layout techniques also change slowly. But the minimum feature size steadily decreases with time (also Voltage, Die Size, etc.)

19 Design Approaches Custom full control of design best results, slowest design time. Semi-custom (std cell) use Cell libraries from vendor cad tools, faster design time Gate Array fastest design time worst speed/power/density best low volume (worst high volume) EPLA/EPLD - FPGA - electrically programmable (in the field) -

20 Close up of Intel Chip? Time Magazine, July 1998

21 Evolution in Speed/Performance Digital Integrated Circuits Introduction Prentice Hall 1995

22 Bipolar (BJT) TTL, Schottky ECL Technologies I^2 L Dual Junction, current controlled devices MOS (FET unipolar)» NMOS, PMOS» CMOS <== our course Single Junction voltage controlled devices GaAs (typically JFET s) OEIC s - MQW s, Integrated Lasers,?

23 Silicon in 2010 Die Area: 2.5x2.5 cm Voltage: 0.6 V Technology: 0.07 µm Density Access Time (Gbits/cm2) (ns) DRAM DRAM (Logic) SRAM (Cache) Density Max. Ave. Power Clock Rate (Mgates/cm2) (W /cm2) (GHz) Custom Std. Cell Gate Array Single-Mask GA FPGA Digital Integrated Circuits Introduction Prentice Hall 1995

24 SIA -National Technology Roadmap for Semiconductors

25 SIA -National Technology Roadmap for Semiconductors 8 inch 18 inch

26 SIA -National Technology Roadmap for Semiconductors

27 SIA -National Technology Roadmap for Semiconductors

28 SIA -National Technology Roadmap for Semiconductors

29 SIA -National Technology Roadmap for Semiconductors

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