Why is MOSFET commonly used?

Automotive electronics frequently employ power MOSFETs , particularly as switching components in electronic control modules and as power converters in contemporary electric automobiles. A wide range of applications also utilizes the hybrid MOS-bipolar insulated-gate bipolar transistor (IGBT).

Mosfet stands for Metal Oxide Semiconductor Field-Effect transistor , is a field effect transistor with high input impedance and low power consumption. The basic structure of the Mosfet is similar to the structure of the planar capacitor.

What are the terminals of the MOSFET?

MOSFET is a unipolar device with 3 terminals; Source, Drain, and Gate . The Gate terminal controlled the flow of carriers from source to drain using an input voltage.

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MOSFET can be used as a?

Q: MOSFET can be used as a?

For the purpose of voltage-controlled capacitors , MOSFET can be used. MOSFET is an electronic device that is used to switch or amplify voltages in circuits. It is a voltage-controlled device where three terminals are used to construct it. MOSFET is also a common power device and semiconductor.

By BYJU'S Exam Prep

Updated on: November 14th, 2023

MOSFET can be used as a Voltage Controlled capacitor. The gate and channel are separated by a thin layer of SiO_2.Therefore, they form a capacitance that varies along with gate voltage. Here, MOSFET acts as a MOS Capacitor. It is controlled by the input gate to source voltage and hence, acts like a voltage-controlled variable capacitor.

Table of content

1. Functional Region of MOSFET
2. Important Facts about the MOSFET

Functional Region of MOSFET

The full form of MOSFET is Metal Oxide Semiconductor Field Effect Transistor. If a MOSFET’s gate and drain are shorted, it can function as a small-signal resistor. When the Drain, Source, and bulk (body) of a MOSFET are shorted, this acts as one capacitor plate, and the Gate acts as another capacitor plate. The three main functional regions of a MOSFET are as follows:

Cut-off Region: The MOSFET is regarded as being in its “OFF” state when it is in the cut-off region. This means that no current passes through it when it is turned OFF.
Saturation Region: Saturation is the state where the MOSFET’s current flow is constant. It acts as a closed switch in this area, enabling current to flow freely.
Linear/Ohmic Region: Increasing the voltage across the drain and source also increases the current flowing through the MOSFET in the linear/ohmic zone.

The MOSFET is considered the basic building block and the most frequently manufactured device. It is also the most common semiconductor device in both analog and digital circuits.

Important Facts about the MOSFET

Essential characteristics of the Metal oxide semiconductor field effect transistor are given below. Knowing about these facts is mandatory to know by candidates preparing for government exams. It is one of the essential topics of physics and electronics.

Mosfet is a voltage-controlled device with high input impedance.
It has two types; P- type and N- type.
No input current is needed to control the load current.
It has three terminals, namely Drain, Source, and Gate.
The Gate terminal controls the flow of carriers between two terminals.
It is a majority carrier device.

Related Questions:

MOSFET can be used as a?

Functional Region of MOSFET

Important Facts about the MOSFET

FAQs on Uses of Mosfet