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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