Introduction:
The collective abbreviation of the two English words 'transfer' and 'resistor' is the transistor.
It basically works on the Resistance Transfer rule. The transistor is called a current driven device. And this current is transfer by resistance. That's why the name of the device is transfer resistor or transistor. Transistor is formed when connecting two Semi-conductor diodes as well. Transistor has three Regions (or Layers) and three terminals or electrodes or leads. The terminals are: collector, base and emitter.
Three scientists of America's Bell Telephone Laboratory invented transistor in 1948. There was a Revolution in the electronic world after the transistor was created.
Amplifier:
The method in which the weak signal is changed into a strong signal, it is called amplification. The device that is used to amplify the amplification process is called an amplifier.
The collective abbreviation of the two English words 'transfer' and 'resistor' is the transistor.
It basically works on the Resistance Transfer rule. The transistor is called a current driven device. And this current is transfer by resistance. That's why the name of the device is transfer resistor or transistor. Transistor is formed when connecting two Semi-conductor diodes as well. Transistor has three Regions (or Layers) and three terminals or electrodes or leads. The terminals are: collector, base and emitter.
Three scientists of America's Bell Telephone Laboratory invented transistor in 1948. There was a Revolution in the electronic world after the transistor was created.
Picture: John Bardeen, William Shockley and Walter Brattain at Bell
Labs-1948
Transistor is the active device. Transistors are usually used for amplification and switching. Transistor has two PN Junctions. Every PN junction has a potential barrier.
Due to the barrier of the transistor, the input supply/signal is not transmitted instantly. As a result, the complete signal is not amplifiable; the part of the original signal is excluded. Particular part of the signal is a major drop in the gap between the faithful operations. To avoid this error and difficulty, the transistor has to be biased. This means that when crossing the signal through a transistor circuit, the circuits have to be biased to maintain the value of the zero signal collector current and collector emitter voltage.
When the transistors send a small signal to the magnified size of the Output, then it is called amplification.The device is called Amplifier. So Transistor is one kind of Device that works as an amplifier & switching.
Fig: PNP & NPN Transistor Symbol
Conditions of biasing are: (1) Base emitter junction forward
biasing and (2) Base collector Junction reverse biasing is done.
Amplifier:
The method in which the weak signal is changed into a strong signal, it is called amplification. The device that is used to amplify the amplification process is called an amplifier.
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