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14.9.4 Applications of MOSFET
Like JFETs, MOSFETs are also used in a wide range of applications. In fact
we may use either JFET or MOSFET in most of the applications
interchangeably. But the MOSFETs require very careful handling. MOSFETs
are used in switching circuits, as phase shift oscillator, as an amplifier, etc.
Fig. 14.33 shows a capacitor-coupled MOSFET switching circuit. As shown
in Fig. 14.33 (a), no gate voltage is applied to the device i.e., V = 0. The
GS
device is off. A positive gate voltage higher than the threshold voltage is
required to turn the device on.
Figure 14.33 MOSFET switching circuit
Figure 14.34 (a) Four-layer three-junction diagramatic representation of a silicon controlled rectifier;
(b) symbolic representation
