Bipolar Junction Transistors vs Field-Effect Transistors

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10 Questions

What type of charge carriers does a bipolar junction transistor (BJT) use?

Electrons and electron holes

How many kinds of charge carriers does a unipolar transistor, like a field-effect transistor (FET), use?

One

What allows a small current injected at one of the terminals of a bipolar transistor to control a much larger current flowing between the terminals?

Bipolar transistor

What are the regions in a single crystal of material where p–n junctions are formed in a bipolar transistor?

n-type and p-type

What displaced the original point-contact transistor due to its superior predictability and performance?

Junction transistors

What is the main difference between a bipolar junction transistor (BJT) and a unipolar transistor like a field-effect transistor (FET)?

BJT uses both electrons and electron holes as charge carriers, while FET uses only one kind of charge carrier

How are the p–n junctions formed in a bipolar junction transistor (BJT)?

By changing the doping of the semiconductor material as it is grown

What allows a small current injected at one of the terminals of a bipolar transistor to control a much larger current flowing between the terminals?

The transistor's capability of amplification or switching

What displaced the original point-contact transistor due to its superior predictability and performance?

Junction transistors

What are the regions in a single crystal of material where p–n junctions are formed in a bipolar transistor?

Two semiconductor types, n-type and p-type

Study Notes

Bipolar Junction Transistors (BJTs) vs Unipolar Transistors

  • BJT uses two types of charge carriers: holes and electrons.
  • Unipolar transistors, like FETs, use only one type of charge carrier.

Operation of BJTs

  • A small current injected at one of the terminals of a bipolar transistor controls a much larger current flowing between the terminals due to the current amplification property of the transistor.

Structure of BJTs

  • P-n junctions are formed in a bipolar transistor in three regions of a single crystal of material: base, collector, and emitter.

History of Transistors

  • The bipolar junction transistor (BJT) displaced the original point-contact transistor due to its superior predictability and performance.

Formation of P-N Junctions

  • P-n junctions in a bipolar junction transistor (BJT) are formed by combining p-type and n-type semiconductor materials.

Key Characteristics of BJTs

  • The current amplification property of a bipolar transistor allows a small current injected at one of the terminals to control a much larger current flowing between the terminals.

Test your knowledge of bipolar junction transistors (BJTs) and field-effect transistors (FETs) with this quiz. Explore the differences between these two types of transistors, their charge carriers, and their operating principles.

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