EECE 363 Quiz 4 2009 Solutions

8 mav2 vt 2 v l va 40 v answer the following

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Unformatted text preview: 3. For the enhancement-type NMOS in the amplifier below: k n' ⎜ ⎟ = 0.8 mA/V2, Vt = 2 V, ⎝L⎠ VA= 40 V. Answer the following questions. a) Show that the transistor is operated in the Saturation mode. (3 points) VG – Vt = 0 V - 2 V = -2 V VD = 5V - (35 kΩ)(0.1mA) = 1.5 V > VG – Vt ∴Saturation b) Calculate the transconductance gm and the drain-source output resistance ro for the MOSFET small-signal equivalent circuit (4 points) gm = (4KID)1/2 = [4(0.4 mA/V2)(0.1 mA)]1/2 = 0.4 mA/V ro = VA/ID = (40 V)/(0.1 mA) = 400 kΩ -3- Qu...
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