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A CS amplifier utilizes an NMOS transistor

with L=0.36μm and W/L=10; it was fabricated in a 0.18μm CMOS process for which μnCox=387μA/V2 and VA=5V/μm. Find the values of gm and A0 obtained at ID=10μA,100μA and 1mA.

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Since,

W/L=10 and L=0.36μm

Therefore, W=3.6μm

For CS Amplifier :-

gm=2μnCox(W/L)ID

Ao=VA2μnCox(WL)ID

(i) For ID=10μA,

gm=(2)(387×106)(10)(10×106)=0.28mA/V

Ao=(5×106)(2)(387×106)(3.6×0.36)10×106=50V/V

(ii) For ID=100μA,

gm=(2)(387×106)(10)(100×106)=0.88mA/V

Ao=(5×106)(2)(387×106)(3.6×0.36)100×106=15.8V/V

(iii) For ID=1mA,

gm=(2)(387×106)(10)(1×103)=2.78mA/V

Ao=(5×106)(2)(387×106)(3.6×0.36)1×103=5V/V

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