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Chapter III : Transistors : Metal-Oxide-Semiconductor Field-Effect Transistors (MOSFETs)

The Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET) is currently attracting the most attention among transistors.
There are two types of MOSFET: N channel (See Fig.3-4(a) Nch below) and P channel (See Fig.3-4(b) Pch below).
Nch is widely used for AC/DC power supplies, DC/DC converters, inverter equipment, etc., whereas Pch is used for load switches, high-side switches, etc.
The differences between the bipolar transistor and the MOSFET are shown in Table 3-1.

Symbol and operation of N-channel MOSFET
Fig. 3-4(a) Symbol and operation of N-channel MOSFET
Symbol and operation of P-channel MOSFET
Fig. 3-4(b) Symbol and operation of P-channel MOSFET
BJT(Current-driven device) MOSFET(Voltage-driven device)
  • Low input impedance
  • Large reverse transfer capacitance
  • Narrow safe operating region
  • Enables low-voltage operation (On voltage is 0.6-0.7 V)
  • High input impedance
  • Small reverse transfer capacitance
  • Wide safe operating region
  • Low gate  power consumption
  • Easy driving

Table 3-1 Comparison of BJT and MOSFET

Chapter III : Transistors

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