EECS 247. Analog-Digital Interface Integrated Circuits Bernhard E. Boser Department of Electrical Engineering and Computer Sciences
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1 EECS 247 -Digital Interface Integrated Circuits 2002 Bernhard E. Boser Department of Electrical Engineering and Computer Sciences EECS 247 Lecture 1: Overview 2002 B. Boser 1 Administrative Course web page: (link to EECS 247) Overview Scope of course Reference texts Grade and homework policy Office hours Tuesday 2 to 3pm Friday 11am to noon EECS 247 Lecture 1: Overview 2002 B. Boser 2
2 Acknowledgement Introduction to System Design and Modeling course, developed by Eric Swanson Notes from Prof. Gray for an earlier version of this course Countless books and articles EECS 247 Lecture 1: Overview 2002 B. Boser 3 -Digital Interface Circuits Anatomy of analog processor analog pre/post processing and D/A converters digital signal processor Input Preprocessing D/A Postprocessing Output EECS 247 Lecture 1: Overview 2002 B. Boser 4
3 Why Digital Processing? Digital circuitry: Cost/function decreases by 29% each year That s 30X in 10 years circuitry: Cost/function is constant Dropping supply voltages threaten feasibility Transition to is inevitable! Ref: International Technology Roadmap for Semiconductors, EECS 247 Lecture 1: Overview 2002 B. Boser 5 Why Processing? The real or physical world is analog Examples: Digital Audio RF receiver Wireline communications EECS 247 Lecture 1: Overview 2002 B. Boser 6
4 Example: Digital Audio Goal Lossless archival and transmission of audio signals Circuit functions: Preprocessing Anti-alias filtering >16Bits, >41kHz Storage Processing (e.g. recognition) D/A Postprocessing Smoothing Input Preprocessing D/A Postprocessing Output EECS 247 Lecture 1: Overview 2002 B. Boser 7 Example: RF Receiver Goals Wireless communication Minimizing use of bandwidth Immunity to interference Circuit functions: Preprocessing Filtering Frequency translation Demodulation Decoding D/A Postprocessing Smooting Input Preprocessing D/A Postprocessing Output EECS 247 Lecture 1: Overview 2002 B. Boser 8
5 Example: Modem Goals Transmit data over inexpensive, noisy channel Maximize distance, minimize errors Circuit functions Transmit Bandwidth efficient and error tolerant data encoding Transmitter Pulse shaping (minimize ISI) Line driver Noisy Channel Frequency (and time) dependent attenuation Noise Receiver Equalization Clock recovery, slicing Receive Decode data Digital Clock and Data in Transmit Transmitter Noisy Channel Receiver Receive Digital Clock and Data out EECS 247 Lecture 1: Overview 2002 B. Boser 9 Signal Processing Fundamentals EECS 247 Filtering Data Data detection, timing recovery EECS 142, 242 RF amplification, mixing Oscillators Nonlinear circuits EECS 247 Lecture 1: Overview 2002 B. Boser 10
6 System Modeling Top-down design Abstraction Key for dealing with complexity (> 10 6 transistors) Each level establishes requirements for next level down in the hierarchy Challenges Unrealizable blocks Physical constraints Modeling errors Number and complexity of blocks Verification EECS 247 Lecture 1: Overview 2002 B. Boser 11 Challenge of IC Fabrication No other EE discipline is less forgiving of errors You can change PLD s or software in a day You can build and test a printed circuit board in a week It takes months to tape out and fabricate a chip Debugging and characterizing a (defective) chip also takes months State-of-the-art chips are never perfect But they have to be good enough for someone to buy them If you want to sell bugs, try a career in software (quote from Eric Swanson) EECS 247 Lecture 1: Overview 2002 B. Boser 12
7 Modeling Tools This is not a tool-centric course Knowledge of design fundamentals lives through many generations of tools Behavioral modeling tools are not always effective: long learning curve Tools we will use MATLAB / Simulink (student version is adequate) SPICE MathCAD, Excel, EECS 247 Lecture 1: Overview 2002 B. Boser 13 EECS 247 versus 240 EECS 247 Macro-models, behavioral simulation, large systems Signal processing fundamentals High level of abstraction: physical constraints (e.g. finite gain, supply, noise) added where appropriate Matlab EECS 240 Transistor level, building blocks Device and circuit fundamentals Little abstraction SPICE EECS 247 Lecture 1: Overview 2002 B. Boser 14
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