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Digital Computers

Digital Computers. Logic Gates & Applications. Digital Computers. Types of Material (Electric Conductivity) Insulator Rubber / wood Conductor Copper / Gold / Iron / Water Semiconductor Silicon / Germanium Superconductor ???. Semi-Conductor Devices. Wire (conductor) Resistor Diode

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Digital Computers

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  1. Digital Computers Logic Gates & Applications

  2. Digital Computers • Types of Material (Electric Conductivity) • Insulator • Rubber / wood • Conductor • Copper / Gold / Iron / Water • Semiconductor • Silicon / Germanium • Superconductor • ???

  3. Semi-Conductor Devices • Wire (conductor) • Resistor • Diode • Electricity can go in one direction • used in rectifier (AC to DC), LEDs • Transistor – used in (Logic Gates) • A voltage or current applied to one pair of the transistor's terminals changes the current flowing through another pair of terminals. • Used as Amplifier & Switching device • Logic Gates • NOT,OR,AND, NOR,NAND , XOR , XNOR • Integrated Circuit

  4. Logic Gates

  5. Logic Gates

  6. Logic Gates

  7. Logic Gates

  8. Universal Gates – NAND NPN-Transistors and Resistor

  9. Constructing Gates with NAND

  10. Constructing Gates with NAND

  11. Applications of Logic Gates • Computation or Processing • Half Adder • Full Adder • Memory • Flip Flop

  12. Binary Addition • Binary Addition • Two Bits • Tree Bits

  13. Half Adder

  14. Full Adder

  15. Full Adder

  16. Full Adder

  17. Parallel Adder

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