Table of Contents
Why are transistors referred to as unipolar and bipolar semiconductors?
BJT is called bipolar because the current in a BJT flows due to both electron and hole carriers, whereas the current in a Field Effect Transistor (FET) flows due to either electron carriers for N-type FET or hole carriers for P-type FET, hence they’re called unipolar transistors.
What is bipolar power transistor?
Power bipolar transistors are semiconductors in which a base n-type or p–type layer is sandwiched between emitter and collector layers of the opposite type. There are two polarities available: PNP and NPN. PNP devices consist of an n-type layer sandwiched between two p-type layers.
Why is a transistor called a transistor?
The word transistor is a combination of transfer and resistance. This is because it transfers the resistance from one end of the device to the other end or we can say, transfer of resistance. Hence, the name transistor. Transistors have very high input resistance and very low output resistance.
What is the major difference between a bipolar and a unipolar device explain?
As their name implies, Bipolar Transistors are “Bipolar” devices because they operate with both types of charge carriers, Holes and Electrons. The Field Effect Transistor on the other hand is a “Unipolar” device that depends only on the conduction of electrons (N-channel) or holes (P-channel).
What is meant by unipolar and bipolar transistor?
Unipolar, field effect transistors are, in their conductive tract, made up of a single type of semiconductor, either N-type or P-type. Bipolar transistors have a junction between N-type and P-type semiconductors in their conductive tract, either in a NPN, or PNP configuration.
What is the major difference between bipolar and unipolar device?
What is called a transistor?
A transistor is a device that regulates current or voltage flow and acts as a switch or gate for electronic signals. Transistors consist of three layers of a semiconductor material, each capable of carrying a current. The semiconductor material is given special properties by a chemical process called doping.
Why it is called diode?
A diode is called a diode because it has two distinct electrodes (i.e. terminals), called the anode and the cathode. A diode is electrically asymmetric because current can flow freely from the anode to the cathode, but not in the other direction.
Why we preferred NPN transistor over PNP transistor usually?
A NPN transistor has electrons as majority charge carriers whereas the PNP transistor has holes as majority charge carrier. The mobility of electrons is better than mobility of holes. mobility of electrons is more than hole,so as a result npn transistor are faster than pnp that’s why they are preferred..
What is the difference between a JFET and a bipolar transistor?
The crucial difference between BJT and JFET is that BJT is a bipolar device while JFET is a unipolar device. It is so because the operation of BJT is dependent on injection and collection of minority charge carriers that includes both electrons and holes.