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Question

Consider the circuit shown in the figure below:

The MOSFET is biased in saturation region having the minimum value of VDD for which the MOSFET will remain in saturation region is _____ V
VT=2.5 V and (μnCoxWL)=0.5 mA/V

  1. 2

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Solution

The correct option is A 2

For the transistor


Vs=VB=VA

due to virtual ground,

thus, Vs=0V

Hence, ID=0(10)10×105=1 mA

ID=μnCoxW2L(VGSVT)2

VGSVT=  IDμnCoxW2L

VGSVT=  1×1030.5×1032

VGSVT=2V

For the MOSFET to be in saturation region

VDSVGSVT

at the edge of saturation

VDS=VGSVT=2V

Vs=0

VD=VGVT

VDD=2V


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