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Computer Technology. Transistor to computer gates. http://upload.wikimedia.org/wikipedia/commons/4/4e/Diopsis.jpg. Computer. Transistor Central Processor Unit or CPU Motherboard. `. http://en.wikipedia.org/wiki/File:Asus_a8n_VMCSM02.jpg.

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Computer Technology

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Computer technology

Computer Technology

Transistor to computer gates

http://upload.wikimedia.org/wikipedia/commons/4/4e/Diopsis.jpg


Computer

Computer

  • Transistor

  • Central Processor Unit or CPU

  • Motherboard

`

http://en.wikipedia.org/wiki/File:Asus_a8n_VMCSM02.jpg

http://upload.wikimedia.org/wikipedia/commons/4/4e/Diopsis.jpg


The transistor

The Transistor

  • Amplifier

  • Remote controlled switch

  • It is the basic element of the computer

  • A modern computer core (CPU) can have over 200,000,000 transistors (200 million).

http://www.flickr.com/photos/oskay/2105641530/


Transistor in digital electronics

Transistor in digital electronics

  • In modern electronics most transistors are used as a switch that is controlled by an input signal.

  • This is accomplished by giving the transistor a large enough signal to snap it on completely or…

  • giving it a small enough signal to turn it off.

  • Commonly these states (on/off) are represented by a zero (off) or one (on).


Transistors

Transistors


Transistors common circuits for computers

Transistors:common circuits for computers

  • Transistors are used to form many basic circuits in computers.

  • These are the five basic circuits:

    • Not

    • AND

    • NAND (Not AND)

    • OR

    • NOR (Not OR)

  • They are named after the logic function they provide.


Not gate

NOT gate

  • Also called a inverter

  • It inverts the input


Not gate using a npn transistor

Not gate using a NPN transistor

If Input A is off then the gate is off and VCC supplies power to the Output Q.


Not gate using a npn transistor1

Not gate using a NPN transistor

If Input A is on then the gate is on and Output Q is pulled down to ground.


Transistor and gate

Transistor-AND gate

  • The basic AND gate has two inputs

  • If both inputs are high, then the output is high

  • Otherwise the output is low


The and gate using pnp transistors

The AND gate using PNP transistors

If Input A or Input B are off then VCC turns on the Q3 and grounds the Output Q.

Q3


The and gate using pnp transistors1

The AND gate using PNP transistors

If Input A AND Input B are on then Q3 is turned off and Output Q is pulled high.

Q3


Transistor nand gate

Transistor-NAND gate

  • The basic NAND gate has two inputs

  • If any inputs are high, then the output is low

  • Otherwise the output is high


The nand gate using pnp transistors

The NAND gate using PNP transistors

If Input A and Input B are on then Output Q is pulled to ground.


The nand gate using pnp transistors1

The NAND gate using PNP transistors

If Input A or Input B are off then Output Q is pulled high.


Transistor or gate

Transistor-OR gate

  • The basic OR gate has two inputs

  • If either input is high, then the output is high

  • Otherwise the output is low


Transistor or gate with pnps

Transistor-OR gate with PNPs

If Input A or Input B are on then Output Q is pulled high.


Transistor or gate with pnps1

Transistor-OR gate with PNPs

If Input A and Input B are OFF then Output Q is pulled low.


Transistor nor gate

Transistor-NOR gate

  • The basic NOR gate has two inputs

  • If either input is high, then the output is low

  • Otherwise the output is high


Transistor nor gate with pnps

Transistor-NOR gate with PNPs


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