expression for Vout

Hi Considering an NMOS with a resistor R connected to its source, 5V to its drain and 3 V to its gate [assuming a threshold of 1 V], is there an expression for the voltage across the resistor in terms of R . I tried deriving it as Id*R , but ended up with Vout on both sides of the eqn, which could not be reduced as Vout= <something>. It would be great if someone can help.Thanks

Asked By: sand
On: Jul 10, 2004 9:14:38 PM

Comments(3)

Draw the small signal model for the device and thenya cana easily derive the equation

Comment By: rskurane
On: Jun 6, 2005 8:11:25 PM

Thanks for your reply.Since the transistor is in saturation [drain->Vdd], Rds = infinity. I wonder if the above equation holds still.

Comment By: sand
On: Jul 11, 2004 4:49:02 PM

Hi, I believe its like this... Vdd = Rds* Ids + Ids * R Ids = (Vdd)/ (Rds + R) Therefore, Vo = Vdd * ((R)/(Rds +R)) Rds => source drain resistance Please post your comment too mfk

Comment By: mfk
On: Jul 11, 2004 2:56:59 AM

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