Are MOSFETs and transistors interchangeable?
In general we can easily replace a BJT with a MOSFET, provided we take care of the relevant polarities. For an NPN BJT, we may replace the BJT with a correctly specified MOSFET in the following manner: Remove the base resistor from the circuit because we don’t typically need it anymore with a MOSFET.
Is transistor better than MOSFET?
There are many benefits of using MOSFET instead of BJT like the following. MOSFET is very responsive as compared with BJT because the majority of charge carriers in the MOSFET are the current. So this device activates very quickly as compared with BJT. Thus, this is mainly used for switching the power of SMPS.
How transistor works as a amplifier?
A transistor acts as an amplifier by raising the strength of a weak signal. The DC bias voltage applied to the emitter base junction, makes it remain in forward biased condition. Thus a small input voltage results in a large output voltage, which shows that the transistor works as an amplifier.
Why is a BJT faster than a MOSFET?
BJT can switch faster than MOSFET due to the less capacitance at the control pin . However MOSFET is more tolerant to heat (stable to thermal changes) and can simulate a good resistor.
What are the advantages of FET over transistor?
Advantages of FETs They are devices controlled by voltage with a very high input impedance (10 7 to 10 12 ohms) FETs generate a lower noise level than the Bipolar Junction Transistor (BJT) FETs are more stable than BJT with temperature
Why is a MOSFET called an unipolar transistor?
Unipolar means single polarity. There are basically two types of polarities which are positive (hole) polarity or negative (electron) polarity. MOSFET is a type of field-effect transistor (FET) in which there is only one type of charge that is either electron or hole. That is why MOSFET is considered as unipolar.
How is MOSFET different from BJT?
Difference between BJT and MOSFET. The BJT is a bipolar junction transistor whereas MOSFET is a metal oxide semiconductor field effect transistor. A BJT has three terminals namely base, emitter and collector, while a MOSFET has three terminals namely source, drain and gate.