![]() As a result, the MOSFET will be OFF and operates in its cutoff region wherein it offers a high impedance path to the flow of current which makes the I DS almost equivalent to zero. Now consider the case where V i applied is 0V, which means the gate terminal of the MOSFETis left unbiased. ![]() Further, it has an input voltage V i applied at its gate terminal (G) while the output V o is drawn from its drain. Here the drain terminal (D) of the MOSFET is connected to the supply voltage V S via the drain resistor R D while its source terminal (S) is grounded. This functionality of MOSFETs is exploited in many electronic circuits as they offer higher switching rates when compared to BJTs ( bipolar junction transistors).įigure 1 shows a simple circuit which uses an n-channel enhancement MOSFET as a switch. This is because, in cut-off region, there is no current flow through the device while in saturation region there will be a constant amount of current flowing through the device, just mimicking the behaviour of an open and closed switch, respectively. On the other hand, when the MOSFETs are required to function as switches, they should be biased in such a way that they alter between cut-off and saturation states. ![]() ![]() Among these, when MOSFETs are to be used as amplifiers, they are required to be operated in their ohmic region wherein the current through the device increases with an increase in the applied voltage. MOSFETs exhibit three regions of operation viz., Cut-off, Linear or Ohmic and Saturation. ![]()
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