EECE 363 Quiz 4 2009 Solutions

4 points d find expressions for the input resistance

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Unformatted text preview: estion 3, Cont’d. c) Sketch and label a small-signal equivalent circuit using the “Hybrid-π” model. (4 points) d) Find expressions for the input resistance Rin and the output resistance Rout as indicated in the circuit. Calculate their numerical values. (4 points) Rin = RG = 10 MΩ Rout = RD//ro = (35 kΩ)//(400 kΩ) = 32.2 kΩ e) Find expressions for the voltage gain vo/vs and calculate its numerical value. vo = gmvgs(RD//ro//RL) = gm[vsRG/(RS+RG)](Rout//RL) ≈ gmvs(Rout//RL) ∴ vo/vs = gm(Rout//RL) = (0.4 mA/V)(32.2 kΩ // 40 kΩ) = 7.14 V/V -4- (5 points)...
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