Compare Unipolar Vs Bipolar Transistor, Transistor which is the electronic module semiconductor, has an amazing capability of controlling the effective resistance by restraining main signal even from a great distance.
There are mainly two types of transistors:
Bipolar Junction Transistor
Unipolar Transistor Junction
In Bipolar Junction Transistor, you will find three types of terminals:
Letter B is used as the abbreviation for Base, likewise ‘C’ is used as the abbreviation for Collector and ‘E’ is the abbreviated form of the Emitter.
BJT or Bipolar Junction Transistor
The first commercial mass production of transistor that was accomplished was that of Bipolar Junction Transistor. Both majority and minority carriers are put to use to conduct the Bipolar Junction Transistors.
Two P – N Junctions are basically there – one is the base collector junction and the other one is that of the base emitter. The material that is responsible for separating the two junctions, is actually a thin superseding semiconductor known as the base region. You must have heard the term regulator of currents, the basic function of BJT is just that.
In here, you will find that a large current is being regulated by a small current. If the collector current and the base current are moving towards the right direction, then the BJTs will be able to operate properly as current regulators. Therefore, moving in the right direction is very important for the proper regulation of current.
Bipolar Junction Transistor is also used extensively, amplifying devices and this is due to the simple fact that the emitter and collector currents are controlled effectively at the base by small amount of current. Both electron flow and hole is found in current, but they are present in different parts of bipolar transistors.
FET or Unipolar Transistor
Unipolar Transistor is also known as FET or the Field Effect Transistor. Though the basic function of the BJT and FET is the same, but both of them uses different procedures altogether.
FET is said to control the current that is present in between two different points. The name suggests that the function of Unipolar Transistor is dependent on the electric field’s effects and also on the movement or flow of electrons in the line of a specific form of semiconductor substance. Due to this very reason, the FETs are also known as the Unipolar transistors.
In here, the holes are the P channel and electrons are the N channel, so the FET utilizes either electrons or the holes for the conduction.
Here also there are three types of terminals found and they are –
These three terminals have their body coupled to the source in almost all cases. It is also used as the device which can control the voltage and it is mainly because the output traits of the FET are set by a field which is reliant on the applied voltage.
Comparison between the two
When you start going through the comparison between the two, you will understand the basic difference between the two and it will also help you in making your concepts clear.
One device is known to be current controlled, whereas the other is said to be voltage controlled.
The device that is current controlled is the BJT, whereas the one which is voltage controlled is known as the FET.
Two flavors are found in Bipolar Junction transistor and they are – PNP and NPN, but in FET transistor you will find more than one and they are N channel and P channel, depletion and enhancement mode, Metal oxide and junction and the list continue.
FETs are bit complicated in the making when compared to the that of BJTs.