What are Transistors?
Asked by Topperlearning User | 23rd Jun, 2014, 11:08: AM
Transistors are probably the most famous semiconductor devices. And while instrumental in the amplification of signals in audio equipment (i.e., radios and headphones), they are also the key ingredient in the development of the computer chip.A junction transistor is obtained by growing a thin layer of one type semiconductor in between two thick layers of other similar type semiconductor. A transistors contain three parts: a base , an emitter , and a collector The central portion called base is very thin and is lightly doped.Emitter is heavily doped and collector is moderately doped.Size of a collector is greater than that of emitter.A transistor can be considered as two diodes connected back to back. The transistor is a current driven device, in which the emitter current controls the collector current.. The transistor's switching ability makes it ideal for the job of storing information in a computer.
Answered by | 23rd Jun, 2014, 01:08: PM
- How do we bias the junctions of a transistor in common emitter configuration?
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- Draw a labeled circuit diagram of a common emitter transistor amplifier. Draw its input and the output characteristics. .
- A transistor has a current gain of 30. If the collector resistance is 6kΩ, input resistance is 1kΩ, calculate its voltage gain?
- The input resistance of a silicon transistor is Ω Its base current is changed by 15μ A, which results in the change in collector current by 2mA. This transistor is used as a common emitter amplifier with a load resistance of 5k Ω. Calculate current gain (βac) transconductance and voltage gain.
- The base of a transistor is lightly doped. Explain why?
- In the given figure, is (i) The emitter (ii) collector forward or reverse biased? Justify.
- Define current amplification factor in a common emitter mode of transistor?
- Calculate emitter current for which β = 100 IB = 20μA?
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