The MOSFET in the amplifier circuit of Fig. P7.124 has Vt = 0.6 V and kn = 5 mA/V2 . We
Chapter 7, Problem 7.124(choose chapter or problem)
The MOSFET in the amplifier circuit of Fig. P7.124 has Vt = 0.6 V and kn = 5 mA/V2 . We shall assume that VA is sufficiently large so that we can ignore the Early effect. The input signal vsig has a zero average. (a) It is required to bias the transistor to operate at an overdrive voltage VOV = 0.2 V. What must the dc voltage at the drain be? Calculate the dc drain current ID. What value must RD have? (b) Calculate the value of gm at the bias point. (c) Use the small-signal equivalent circuit of the amplifier to show that vo vsig = 1+(R2/R1) 1+ (1+R2/R1) gmR D and Rin = 1 gm (1+gmR D R1 R1 +R2 ) where R D = RD (R1 +R2) (d) Evaluate vo/vsig and Rin. R2 R1 RD VDD = + 10 V vsig vo Rin 0.5 M 0.5 M Figure P7.124 =P.S. This feedback amplifier circuit and the gain formula should remind you of an op amp connected in the noninverting configuration. We shall study feedback formally in Chapter 11.
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