Basic Electronic Systems: Transistors

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Questions and Answers

What is the basic electronic system used nowadays?

Semiconductor device

What is the commonly used device in electronic systems?

Bipolar Junction Transistor (BJT)

What are the three terminals of a BJT?

  • Anode, Cathode, Gate
  • Source, Gate, Drain
  • Collector, Base, Emitter (correct)

What are the two types of BJTs?

<p>pnp and npn (C)</p> Signup and view all the answers

What does the term 'bipolar' in BJT refer to?

<p>The participation of both holes and electrons in the injection process into the oppositely polarized material</p> Signup and view all the answers

What are the two types of bias for a single pn junction?

<p>Forward bias and reverse bias (A)</p> Signup and view all the answers

How many different bias configurations are possible for a two-pn-junction device?

<p>Four</p> Signup and view all the answers

Flashcards

Bipolar Junction Transistor (BJT)

A semiconductor device used as an amplifier and logic switch, with three terminals (collector, base, emitter).

BJT terminals

Collector (C), Base (B), and Emitter (E).

NPN transistor

A three-layer semiconductor device with two n-type and one p-type layers.

PNP transistor

A three-layer semiconductor device with two p-type and one n-type layers.

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Semiconductor Device

A device that uses the special properties of semiconductor materials to control electrical current.

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Forward Bias

Applying voltage in the direction that allows current to flow through a pn junction.

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Reverse Bias

Applying voltage in the opposite direction preventing current flow through a pn junction.

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BJT layers

Semiconductors arranged in layers of alternating n-type and p-type materials.

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Bipolar

In BJTs, both holes and electrons participate in current flow.

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Pn Junction

Two different semiconductor materials bonded together, creating a junction with special electrical properties.

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Study Notes

Basic Electronic System

  • Modern electronic systems rely on semiconductor devices.
  • Bipolar Junction Transistors (BJTs) are common and crucial.
  • BJTs can function as amplifiers and logic switches.
  • BJTs have three terminals: collector (C), base (B), and emitter (E).

Transistor Types

  • Two main types of BJTs: pnp and npn.

Transistor Construction

  • BJTs are three-layer semiconductor devices.
  • npn transistors have two n-type and one p-type layers.
  • pnp transistors have two p-type and one n-type layers.
  • "Bipolar" refers to the involvement of both holes and electrons in the current injection process across the junctions.

PN Junction Biasing

  • A single pn junction can be either forward-biased or reverse-biased.
  • A BJT with two pn junctions has four possible biasing conditions.

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