6.012 Microelectronic Devices and Circuitsweb.mit.edu/6.012/www/SP07-L1.pdf · Overview of 6.012...
Transcript of 6.012 Microelectronic Devices and Circuitsweb.mit.edu/6.012/www/SP07-L1.pdf · Overview of 6.012...
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MIT, Spring 2007
6.012 Microelectronic Devices and Circuits
Charles G. Sodini
Judy Hoyt, Jing Kong
Ke Lu, Ivan NausiedaRavi Palakodety, Riccardo Signorelli
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Lecture 1 – 6.012 Overview
• Contents:– Overview of 6.012
• Reading Assignment: – Howe and Sodini, Ch. 1
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Overview of 6.012
• Introductory subject to microelectronic devices and circuits
• Microelectronics is the cornerstone of:– Computer revolution– Communications revolution– Consumer Electronics revolution
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In last 30 years, computer performance per dollar has improved more than a million fold!
Microelectronics:cornerstone of computing revolution
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In last 20 years, communication bandwidth through a single optical fiber has increased by ten-thousand fold.
Microelectronics: cornerstone of communications revolution
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Microelectronics: cornerstone of consumer electronics revolution
Low power electronics enabling a variety of portable devices
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Si digital microelectronics today
• A thick web of interconnects, many levels deep.
• High density of very small transistors.
Take the cover off a microprocessor. What do you see?
Intel’s Pentium IV
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Interconnects
Today, as many as 7 levels of interconnect using Cu.
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Transistor size scalingsize of human blood cell
2-orders of magnitude reduction in transistor size in 30 years.
Rabies virus at same scale
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Evolution of transistor density
Moore’s Law: doubling of transistor density every 1.5 years
4-orders of magnitude improvement in 30 years.
Intel processors
2x/1.5year
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Benefits of increasing transistor integration
• system performance
• cost-per-function,
• power-per-function, and
• system reliability.
Exponential improvements in:
Experimental SOI microprocessor from IBM
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Clock speed
4-orders of magnitude improvement in 30 years.
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Transistor cost
3-order of magnitude reduction in 30 years.
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Cost per function
4-order of magnitude reduction in 30 years.
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Keys to success of digital microelectronics: I. Silicon
• Cheap and abundant
• Amazing mechanical, chemical and electronic properties
• Probably, the material best known to humankind
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Keys to success of digital microelectronics:II. MOSFET
MOSFET = switchMetal-Oxide-Semiconductor
Field-Effect Transistor
Good gain, isolation, and speed
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Modern MOSFET structure
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Keys to success of digital microelectronics:III. MOSFET scaling
MOSFET performance improves as size is decreased:• Shorter switching time• Lower power consumption
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Keys to success of digital microelectronics:IV. CMOS
• “Complementary” switch activates with V<0.• Logic without DC power consumption.
CMOS: Complementary Metal-Oxide-Semiconductor
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Keys to success of digital microelectronics:V. Microfabrication technology
• Tight integration of dissimilar devices with good isolation
• Fabrication of extremely small structures, precisely and reproducibly
• High-volume manufacturing of complex systems with high yield.
1 Gbit DRAM from IBM
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Keys to success of digital microelectronics:VI. Circuit engineering
• Simple device models that:– are based on physics– allow analog and digital circuit design– permit assessment of impact of device variations on circuit performance
• Circuit design techniques that:– are tolerant to logic level fluctuations, noise and crosstalk– are insensitive to manufacturing variations– require little power consumption
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Content of 6.012• Deals with microelectronic devices
– Semiconductor physics– Metal-oxide-semiconductor field-effect transistor (MOSFET)– Bipolar junction transistor (BJT)
• Deals with microelectronic circuits– Digital circuits (mainly CMOS)– Analog circuits (BJT and MOS)
• The interaction of devices and circuits captured by models