10 Questions
What is the classification of germanium, silicon, and carbon based on their electrical conductivity?
Semiconductors
What is the resistivity range of semiconductors compared to that of conductors and insulators?
10-5 to 10+4 Ωm
Which group of the periodic table do Germanium and Silicon belong to?
Group IV
What are compound semiconductors formed from?
Group II and VI elements
What is the resistivity of Germanium and Silicon?
0.6 and 1.5 × 103 Ωm respectively
What does the arrow on the gate of a -channel JFET point?
In
What is connected to each end of the -channel in an -channel JFET?
Wire leads
Where is the drain located in the basic structure of an -channel JFET?
Upper end
How many terminals does a JFET have?
Three
What is the structural difference between an -channel and a -channel JFET?
-channel has the arrow pointing in, while -channel has the arrow pointing out
Study Notes
Introduction to FET
- FET (Field-Effect Transistor) is the second major type of transistor, unlike BJTs, FETs are unipolar devices operating with one type of charge carrier.
- There are two main types of FETs: Junction Field-Effect Transistor (JFET) and Metal Oxide Semiconductor Field-Effect Transistor (MOSFET).
Comparison with BJTs
- BJTs are current-controlled devices, whereas FETs are voltage-controlled devices.
- In BJTs, base current (IB) controls collector current (IC), whereas in FETs, voltage between gate and source terminals controls the current.
Characteristics of FETs
- FETs have very high input resistance.
JFET (Junction Field-Effect Transistor)
- JFET operates with a reverse-biased p-n junction to control the current in a channel.
- JFETs fall into two categories based on their structure: n-channel or p-channel.
Test your knowledge about semiconductors and their properties in electronic circuits. Learn about the unique characteristics of germanium, silicon, and carbon and how they are used in modern technology.
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