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Examoogle • User • info@examoogle.com • EE-2024-8821
Chapter 1 of 12 • Page 1 of 248🔒 Protected PDF • Watermarked
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Which of the following terminals does not belong to the MOSFET?
Drain
Gate
Base
Source
Base
A MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) is a voltage-controlled device consisting of three main terminals: Gate, Drain, and Source. The 'Base' terminal is characteristic of Bipolar Junction Transistors (BJTs), not MOSFETs.
A MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) is a voltage-controlled device consisting of three main terminals: Gate, Drain, and Source. The 'Base' terminal is characteristic of Bipolar Junction Transistors (BJTs), not MOSFETs.
ID=μnCoxLW[(VGS−Vth)VDS−2VDS2] — Drain current in the linear region
ID=21μnCoxLW(VGS−Vth)2 — Drain current in the saturation region
The MOSFET operates by creating an electric field between the Gate and the channel region. This field modulates the conductivity of the channel, allowing current to flow between the Source and the Drain. The Base terminal in a BJT, by contrast, controls current via charge carrier injection, which is fundamentally different from the capacitive field-effect mechanism of a MOSFET.
MOSFET terminals: Gate, Drain, Source.
BJT terminals: Base, Collector, Emitter.
MOSFETs are unipolar devices (current carriers are of one type).
BJTs are bipolar devices (current involves both electrons and holes).
High input impedance
High switching speed
Low power consumption
Susceptible to electrostatic discharge (ESD)
Lower current handling compared to some BJTs
Digital logic circuits
Power converters and switching supplies
Microprocessors
In MOSFETs, the Gate is electrically isolated from the channel by a thin insulating layer (usually SiO2).
Option C is the correct answer because the term 'Base' refers to the input control terminal of a Bipolar Junction Transistor (BJT), not a MOSFET.
C is correct — The Base terminal belongs to a BJT, whereas a MOSFET utilizes Gate, Drain, and Source terminals.
Always remember the mnemonic: MOSFET uses Gate/Drain/Source, while BJT uses Base/Collector/Emitter. This distinction is foundational for all transistor-based circuit analysis.