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Questions and Answers
What is the main reason that a junction transistor is called a bipolar junction transistor?
What is the main reason that a junction transistor is called a bipolar junction transistor?
- It has two back-to-back p-n junctions
- It can carry current using both electrons and holes (correct)
- It has two types: n-p-n and p-n-p transistors
- It is made of three doped regions
What type of semiconductor layer separates the emitter and collector in an n-p-n transistor?
What type of semiconductor layer separates the emitter and collector in an n-p-n transistor?
- N-type semiconductor
- P-type semiconductor (correct)
- Metallic layer
- Insulator layer
How is a p-n-p transistor different from an n-p-n transistor in terms of the layers used?
How is a p-n-p transistor different from an n-p-n transistor in terms of the layers used?
- A p-n-p transistor has the collector separated from the base by an insulator
- A p-n-p transistor has an arrow pointing towards the base
- A p-n-p transistor has an n-type base layer (correct)
- A p-n-p transistor has two layers of p-type semiconductor
How can you differentiate between an emitter and a collector in a circuit symbol of a transistor?
How can you differentiate between an emitter and a collector in a circuit symbol of a transistor?
What is the distinguishing feature between an n-p-n transistor and a p-n-p transistor according to the circuit symbol?
What is the distinguishing feature between an n-p-n transistor and a p-n-p transistor according to the circuit symbol?
What does the arrow in the circuit symbol of a transistor represent?
What does the arrow in the circuit symbol of a transistor represent?
Why is a bipolar junction transistor (BJT) named as such?
Why is a bipolar junction transistor (BJT) named as such?
How does a p-n-p transistor differ from an n-p-n transistor in terms of the base layer?
How does a p-n-p transistor differ from an n-p-n transistor in terms of the base layer?
What type of semiconductor layer separates the emitter and collector in a p-n-p transistor?
What type of semiconductor layer separates the emitter and collector in a p-n-p transistor?
In an n-p-n transistor, which direction does the arrow on the emitter symbol point towards?
In an n-p-n transistor, which direction does the arrow on the emitter symbol point towards?
Why is a transistor with two back-to-back p-n junctions referred to as bipolar?
Why is a transistor with two back-to-back p-n junctions referred to as bipolar?
What is the significance of the arrow direction in the circuit symbol of a transistor?
What is the significance of the arrow direction in the circuit symbol of a transistor?
Flashcards
Why 'Bipolar'?
Why 'Bipolar'?
It uses both electrons and holes to carry current.
n-p-n transistor: middle layer?
n-p-n transistor: middle layer?
P-type semiconductor.
p-n-p vs. n-p-n: base layer?
p-n-p vs. n-p-n: base layer?
A p-n-p transistor uses an n-type base layer.
Emitter vs. Collector?
Emitter vs. Collector?
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n-p-n vs. p-n-p: circuit symbol?
n-p-n vs. p-n-p: circuit symbol?
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Transistor arrow meaning?
Transistor arrow meaning?
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BJT naming?
BJT naming?
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p-n-p transistor base?
p-n-p transistor base?
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n-p-n: what separates emitter/collector?
n-p-n: what separates emitter/collector?
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n-p-n arrow direction?
n-p-n arrow direction?
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Back-to-back p-n junctions?
Back-to-back p-n junctions?
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Arrow direction significance?
Arrow direction significance?
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Study Notes
Transistor Fundamentals
- A bipolar junction transistor (BJT) is called so because it has two back-to-back p-n junctions.
Junction Layers
- In an n-p-n transistor, the emitter and collector are separated by a thin p-type semiconductor layer.
- In a p-n-p transistor, the emitter and collector are separated by a thin n-type semiconductor layer.
Transistor Types
- A p-n-p transistor differs from an n-p-n transistor in terms of the layers used: p-n-p has a p-type emitter, n-type base, and p-type collector, whereas n-p-n has an n-type emitter, p-type base, and n-type collector.
- The base layer in a p-n-p transistor is n-type, whereas in an n-p-n transistor, it is p-type.
Circuit Symbols
- In a circuit symbol, the emitter is represented by an arrow, which points towards the base for an n-p-n transistor and away from the base for a p-n-p transistor.
- The arrow in the circuit symbol of a transistor represents the direction of conventional current flow.
- The direction of the arrow in the circuit symbol distinguishes between an n-p-n transistor and a p-n-p transistor.
Bipolar Junction Transistors
- A transistor with two back-to-back p-n junctions is referred to as bipolar because it has two junctions: one between the emitter and base, and another between the collector and base.
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