Computer chip -Microprocessor COMPARISON OF PENTODE AND TRANSISTOR CHARACTERISITCS PENTODE BIPOLAR TRANSISTOR.

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Presentation transcript:

Computer chip -Microprocessor

COMPARISON OF PENTODE AND TRANSISTOR CHARACTERISITCS PENTODE BIPOLAR TRANSISTOR

SEMICONDUCTORS THE MATERIALS THAT HAVE DRIVEN THE AGE OF DIGITAL COMMUNICATION.

THE BIG BANG!

AFTER THE BIG BANG THERE EXISTED: SUB-ATOMIC PARTICLES AND RADIATION

THE SUB-ATOMIC PARTICLES THE ELECTRON HAS CHARGE = -1 MASS = 0 THE PROTON HAS CHARGE = +1 MASS = 1 THE NEUTRON HAS CHARGE = 0 MASS = 1

THE PERIODIC TABLE OF ELEMENTS

THE STRUCTURE OF THE ATOM

CRYSTALS ARE MADE UP FROM LOTS OF ATOMS

CRYSTALS

GROWING SILICON CRYSTALS

THE ATOM CORES CONSISTS OF PROTONS & NEUTRONS

Energy Level 1. *

Energy Level 2. *

BAND GAP IN THE ENERGY LEVELS

The Hydrogen Spectrum

ELECTROMAGNETIC SPECTRUM

E eV = hc λ µm E eV = 1.24 λ µm

TRANSMISSION SPECTRUM OF SILICON

DOPING SEMICONDUCTORS

PN JUNCTION

PN DIODE CHARACTERISTICS

BIPOLAR JUNCTION TRANSISTOR

MANUFACTURE OF INTEGRATED CIRCUITS

CIRCUITS PRINTED ON A SILICON WAFER

TIME FOR A BREAK

σ =ne µ µ=V d E f WHY ARE WE INTERESTED IN OTHER SEMICONDUCTORS ? MOBILITY cm 2 V -1 S -1 N-type SILICON 1000 GALLIUM ARSENIDE 4000 INDIUM GALLIUM ARSENIDE 10000

SILICON INDIRECT GAP GALLIUM ARSENIDE DIRECT GAP

TRANSMISSION SPECTRA OF FOUR SEMICONDUCTORS

Material Energy gap (eV) 0K300K Si Ge InP GaP GaAs Semiconductor Band Gaps Display

BAND GAP ENGINEERING

III-V MOLECULAR BEAM EPITAXY

GaN Laser Structure

UV-LASER STRUCTURE

THE END

Comparison with vacuum tubes [edit] Advantagesedit Small size and minimal weight, allowing the development of miniaturized electronic devices. Highly automated manufacturing processes, resulting in low per-unit cost. Lower possible operating voltages, making transistors suitable for small, battery-powered applications. No warm-up period for cathode heaters required after power application. Lower power dissipation and generally greater energy efficiency. Higher reliability and greater physical ruggedness. Extremely long life. Some transistorized devices have been in service for more than 50 years. Complementary devices available, facilitating the design of complementary-symmetry circuits, something not possible with vacuum tubes.complementary-symmetry Insensitivity to mechanical shock and vibration, thus avoiding the problem of microphonics in audio applications.microphonics [edit] Limitationsedit Silicon transistors typically do not operate at voltages higher than about 1000 volts (SiC devices can be operated as high as 3000 volts). In contrast, vacuum tubes have been developed that can be operated at tens of thousands of volts.voltsSiC High-power, high-frequency operation, such as that used in over-the-air television broadcasting, is better achieved in vacuum tubes due to improved electron mobility in a vacuum.television broadcastingelectron mobility Silicon transistors are much more vulnerable than vacuum tubes to an electromagnetic pulse generated by a high-altitude nuclear explosion.electromagnetic pulsenuclear explosion Silicon transistors when amplifying near the saturation point typically fail and create distortion. Vacuum tubes under the same stress conditions fail more gradually and do not generally create distortion.