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Which of the following is true for an NMOS transistor operating in a linear region?


1. VDS < (VGS – VT)
2. VDS > (VGS – VT)
3. VGS > (VDS – VT)
4. VGS < (VDS – VT)

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Correct Answer - Option 1 : VDS < (VGS – VT)

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:

\({{I}_{D}}=\frac{1}{2}{{\mu }_{n}}{{C}_{OX}}\frac{W}{L}{{\left( {{V}_{GS}}-{{V}_{th}} \right)}^{2}}\)

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