文档介绍：INTRODUCTION
• The Role and Place of Modern Mixed Analog–Digital
Chips
• Very Large Scale Integration (VLSI) Technologies
• Over 1 million transistors
• From 70’s puter Era had begun
• Analog Signal Processing reduced but not disappeared
• The need to interface puter to the analog world
• The need for analog–enhances digital performance
Layout
THE NEED TO INTERFACE PUTER TO
THE ANALOG WORLD
• Computers work in the real word
• Automobile
• Radio, computerized engine control, safety, navigation
aids, etc.
• Cellular telephony
• Transmission and reception of both analog and digital
signals
• A/D and D/A converters
Layout
THE NEED TO INTERFACE PUTER TO
THE ANALOG WORLD
• Pre–Post Conversion signal condition
• Amplification, filtering for antialiasing or smoothing,
sampling, holding, multiplexing etc.
• Direct signal processing without A/D conversion
• Medium SNR systems, high speed, low power
• Interface with sensors
• Receiving antennas, transmission lines,
• Drive for attuators
• Transmitting antennas, transmission lines
Layout
THE NEED TO INTERFACE PUTER TO
THE ANALOG WORLD
• MAD circuits have been realized in metal–oxide
semiconductor (MOS) technology
• Precision ratio capacitor arrays
• pensated MOS operational amplifiers
• High performances A/D converters
• High performances Switched–Capacitor filters
• Continuous time filters
• PCM encoders–decoders
Layout
THE NEED FOR ANALOG-ENHANCED DIGITAL
PERFORMANCE
• Analog circuits make possible the high performance of
digital systems
• Hard disk drive
• munication links
• High speed digital circuits are analog in nature
• Clock recovery circuits
• PLL
• Charge pumps
Layout
ADVANTAGE OF MIXING ANALOG AND DIGITAL
CIRCUITS ON THE SAME CHIP
• The size of the system is reduced
• The speed of the operation can be increased
• The power dissipation is decreased
• The design flexibility is increased –> high # of channels
• The reliabili