Correct Answer - Option 1 : V
DS < (V
GS – V
T)
Three regions of MOSFET operation (nMOS) are:
Linear/ Ohmic/ Triode region:
VGS > Vth
VDS < VGS – Vth
The current equation for a MOSFET in the linear region is given by:
\({{I}_{D}}={{\mu }_{n}}{{C}_{ox}}\frac{W}{L}\left\{ \left( {{V}_{GS}}-{{V}_{th}} \right){{V}_{DS}}-\frac{V_{DS}^{2}}{2} \right\}\)
Cut off region:
VGS < Vth
ID = 0
VGS = Gate to source voltage
Vth = Threshold voltage
Saturation region:
VGS > Vth
VDS > VGS – Vth
The current equation for a MOSFET in the saturation region is given by:
\({{I}_{D}}=\frac{1}{2}{{\mu }_{n}}{{C}_{OX}}\frac{W}{L}{{\left( {{V}_{GS}}-{{V}_{th}} \right)}^{2}}\)