Junction Transistor
Chapter Name : Semiconductor Electronics: Materials, Devices And Simple Circuits |
Sub Topic Code : 101_12_14_09_12 |
Topic Name : Junction Transistor |
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Sub Topic Name : Feedback Amplifier And Transistor Oscillator |
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Introduction
A transistor is a semiconductor device used to amplify and switch electronic signals and electrical power.
Pre-Requisites:
Transistor
Activity:
Silicon (Si) is the most widely used material in semiconductor devices.
Real Life Question:
What are transistors?
Key Words / FlashCards
| Key Words | Definitions (pref. in our own words) |
|---|---|
| Transistor | A transistor is a semiconductor device used to amplify and switch electronic signals and electrical power. |
Learning aids / Gadgets
| Gadgets | How it can be used |
|---|---|
| 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. |
Real life uses :
Building circuits.
Places to visit :
Digital circuits.
Practical examples around us
| Examples | Explainations |
|---|---|
| Solar Cell | Solar cells are typically illuminated with sunlight and are intended to convert the solar energy into electrical energy. |
What you learn in Theory:
An oscillator tends to start up, its oscillation amplitude then grows (usually rapidly), until limited by some process or feature of the system. The action of this limiting process is to reduce the effective loop gain until its modulus is unity. The oscillation then continues with a waveform of essentially constant amplitude.
What you learn in Practice:
All feedback oscillators require some device or mechanism which provides gain combined with a feedback arrangement which sends some of the system's output back to be re-amplified after a suitable time delay.