Metal oxide silicon Field Electric Transistor is a type of Field
electric Transistor that is controlled by the oxidation if a semi
conductor usually a silicon.
Mosfets
requires not input current to control the load current when compared
with transistors that uses both charge
and holes as electron carriers
called bipolar junction transistors.
Mosfets
also acts as switches and fuses used for either stepping large voltages
to smaller voltages or allowing a voltage to pass throught a circuit
without alterations.
They
can be used as monolithic integrated circuit which can be found in
circuits like motherboard. It acted as the fundamentals for creating
microprocessors in a circuit.
Mosfets became widely used because of it ease in fabrication process, making it easy to be utilized by modern circuitry.
MOSFET
structure is obtained by growing a layer of silicon dioxide on top of a
silicon substrate. This is usually done by depositing a layer of
polycrystalline silicone.
Mosfets are categorized basically into two: P-channel and n-channel.
P-channel:
P-channel mosfets act as fuses in a circuit, allowing voltages to flow
from one terminal to another without voltage alterations. It consist of
majority of holes which acts as current carriers when Mosfets is
activated.
P-channel
are made up of three basic section: gate, source, and drain.The gate
are made up of basically n-type materials while the source and drain are
made up of p-type materials allowing the transistor to act as a fuse.
In
order to turn on a P-channel mosfets, apply a positive voltage at the
source and a negative voltage at the gate. With sufficient positive
voltage applied at the source,it will cause the positive voltage to flow
through to the drain.
Turning
off a P-channel mosfets is quite easy. All we need do is to remove the
negative voltage applied accros the gate terminal or cut off the
positive voltage applied to the source then the MOSFET will go off.
P-channel mosfets are conventionally odd numbers such as 4407, LM 393, 4409 ETC.
N-channel:
N-channel mosfets are metal oxide silicon Field electric transistors
that acts as switches. It is comprises of majorly electrons which acts
as current carriers. It has an N-channel between the source and the
drain comprising of four terminals such as gate, source, drain and body.
In this type
of transistor, current flow is as a result of the negative electrons
present in the mosfet. When positive voltage is applied at the gate
terminal, the holes present at the oxide layer are pushed downward to
the substrate.
With
the depletion region populated by negative charges which are associated
with acceptor atoms, the n-channel is formed. If voltages are applied
between the drain and the source, current flows very freely between
source and drain, while the gate voltage controls the current in the
channel.
N-channel
mosfets are usually identified by their unique even numbers. Mosfets
with numbers such as 4406, 4408, LM 398 ETC are regarded as n-channel
mosfets.