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set04new - r out = 50k Ω if the transistor has = 0 02V...

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ECE3050 Homework Set 4 1. (a) Calculate the drain current in an NMOS transistor if K = 125 µ A / V 2 , V TO = 2V , λ =0 , V GS =0V ,and V DS =6V .[ 0 . 5mA ] (b) Repeat assuming λ =0 . 025V 1 .[ 0 . 575mA ] 2. An n -channel MOSFET has K = 125 µ A / V 2 , V TO =1V ,and λ =0 . 02V 1 .A twha td ra in current will the MOSFET no longer be able to provide any voltage gain when connected as a common-source ampli f er? Note, the maximum gain is denoted by µ F and it is given by µ F = g m r 0 . The object here is to determine the maximum I D such that µ F 1 .Th i sw i l l require you to select V DS that minimizes µ F before solving for I D .[ 1 . 25A ] 3. A common-source ampli f er has the drain load resistance R
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Unformatted text preview: r out = 50k Ω if the transistor has λ = 0 . 02V − 1 ? Use the relations r = ¡ λ − 1 + V DS ¢ /I D , V DS = 18 − I D R D , and r out = r k R D . [ . 189mA , 6 . 67V ] 4. The drain current in an n-channel JFET is given by i D = I DSS (1 − v GS /V P ) 2 for v GS > V P and i D = 0 for v GS ≤ V p , where I DSS = I DSS (1 + λv DS ) . For the n-channel JFET, V P < . Show that the expression for the JFET current can be represented in exactly the same form as that of the MOSFET using the substitution V TO = V P and K = I DSS /V 2 P . 1...
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