4. Introduction to MOSFETs (Metal-Oxide-Semiconductor Field Effect Transistors)
MOSFETs are voltage-controlled, unipolar devices essential in both analog and digital circuits. They can be categorized as either enhancement-mode or depletion-mode devices, each with distinct operational characteristics. The chapter also covers the construction, operating regions, advantages over other transistor types, and applications of MOSFETs, leading to a focus on their significance in modern electronics.
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What we have learnt
- MOSFETs are insulated gate transistors with high input impedance.
- They operate in three distinct regions: cut-off, triode, and saturation.
- E-MOSFET functions by forming a conductive channel when a specific gate voltage is applied.
Key Concepts
- -- MOSFET
- A Metal-Oxide-Semiconductor Field Effect Transistor that is a voltage-controlled unipolar device.
- -- Enhancementmode MOSFET (EMOSFET)
- A type of MOSFET that does not have a conductive channel until a gate voltage is applied.
- -- Depletionmode MOSFET (DMOSFET)
- A MOSFET type that has a pre-existing conductive channel which can be enhanced or depleted based on gate voltage.
- -- Threshold Voltage (Vth)
- The gate voltage at which the MOSFET begins conducting.
- -- Operating Regions
- The three operational phases of E-MOSFET: Cut-off, Triode, and Saturation.
- -- Drain Current (ID)
- The current flowing from the drain to the source in a MOSFET.
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