Chapter Name : Semiconductor Electronics: Materials, Devices And Simple Circuits |
Sub Topic Code : 101_12_14_09_01 |
Topic Name : Junction Transistor |
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Sub Topic Name : Junction Transistor |
A transistor is a semiconductor device used to amplify and switch electronic signals and electrical power.
Transistor
Silicon (Si) is the most widely used material in semiconductor devices.
What are Junction transistors?
Key Words | Definitions (pref. in our own words) |
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Junction transistors | A bipolar junction transistor consists of three regions of doped semiconductors. |
Gadgets | How it can be used |
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microprocessors | All transistor types can be used as the building blocks of logic gates, which are fundamental in the design of digital circuits. Transistors act as on-off switches; in the MOSFET, for instance, the voltage applied to the gate determines whether the switch is on or off. |
Building circuits.
Digital circuits
Examples | Explainations |
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Solar Cell | Solar cells are typically illuminated with sunlight and are intended to convert the solar energy into electrical energy. |
The first type of transistor to be mass-produced, is a combination of two junction diodes, and is formed of either a thin layer of p-type semiconductor sandwiched between two n-type semiconductors (an n-p-n transistor), or a thin layer of n-type semiconductor sandwiched between two p-type semiconductors (a p-n-p transistor).
Bipolar transistors can be made to conduct by exposure to light, since absorption of photons in the base region generates a photocurrent that acts as a base current; the collector current is approximately ? times the photocurrent.
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