Question
Download Solution PDFIn a UJT, the emitter terminal is:
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFThe UJT is a three-terminal, semiconductor device which exhibits negative resistance and switching characteristics for use as a relaxation oscillator in phase control applications.
- We observe that the emitter terminal is p-type.
- The structure of a UJT is quite similar to that of an N-channel JFET.
- In a unijunction transistor, the emitter is heavily doped while the N-region is lightly doped, so the resistance between the base terminals is relatively high, typically 4 to 10 kilo Ohm when the emitter is open.
The basic differences between the UJT and the BJT are as follows:
|
UJT |
BJT |
|
Only one junction is present in UJT. |
It consists of two Junctions. It is a two junction transistor. |
|
The conduction in this transistor is based on the flow of the majority of the carriers through it. |
The conduction in this transistor is completely based on the flow of both majority as well as the minority carriers through it. |
|
It can be used as the voltage control device. |
It can be categorized as the current control device. |
|
UJT cannot be preferred for amplification. |
BJT can be used as amplifiers. |
Last updated on Jul 21, 2025
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