Question
Download Solution PDFWhat is the name of the device that have three terminals and two layers?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFConcept:
Uni-Junction Transistor:
- It is a 2-layer, single junction, 3-terminal device.
- The UJT is formed of a lightly doped n-type semiconductor on which a highly doped p-type semiconductor is infused.
- This forms a single PN junction and thus it is called Unijunction Transistor.
- It exhibits negative resistance and switching characteristics for use as a relaxation oscillator in phase control applications.
- UJT is not able to amplify but it has the ability to control a large AC power with a small signal.
- The structure of the UJT is similar to the N-Channel JFET.
Additional Information
| Differences between UJT and BJT | |
| UJT | BJT |
| Only one junction is present. | It is a two-junction transistor. |
| The conduction in this transistor is based on the flow of majority charge carriers. | The conduction in this transistor is based on both majority and minority charge carriers. |
| It can be used as a voltage-controlled device. | It can be used as a current-controlled device. |
| It can not be used as an amplifier. | It can be used as an amplifier. |
Last updated on Jun 11, 2025
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