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Vas Ros 4 = 10-3 Voc RC R Cc V R RE Figure 10.7.1 [40 minutes] 10.8 [35 points] For the amplifier circuit in Fig. 10.8.1 (refer to Figure below), assume that the BJT has VBE = 0.7 V and 100 and neglect the Early effect. [6 points] (a) Find the de bias current Ic and the de collector voltage VC. (6 points] (b) Give the small-signal equivalent circuit to- gether with values of all its components, utilizing the T model for the BJT [3 points] (c) Find the input resistance Rin [2 points] (d) Find output resistance Rout [6 points] (e) Find the overall midband gain Vo/Vsig [12 points] (f) Use the method of short-circuit time constants to obtain an estimate of the 3-dB frequency f 10.9 [30 minutes] The MOSFET in the common-source amplifier in [30 points] Fig. 10.9.1 (refer to Figure on following page) is operating at g 5 mA/V and has Cgs = 1 pF and Cd 0.2pF. Channel-length modulation is negligibly small. (a) Find the midband voltge gain in dB. (b) Find the upper 3-dB frequency. H [5 points] [7 points] (c) Find the value of Cg that places the pole it [4 points] introduces at 1 Hz. (d) Find the value of Cs that places the pole it [4 points] introduces at 100 Hz. (e) Find the value of Cp that places the pole it [4 points] introduces at 10 Hz. (f) Sketch and carefully label the Bode plot for [6 points] the gain magnitude. Specify the lower 3-dB fre- quency... +15 V 5.1 k R150 kn Re 1 F HH -0% Ca Rus R₁ 15 k w R₂ R=1k www 330 F H Ca Ves H R Raz 51 kn R15 k 33 F H Figure 10.8.1

Fig: 1


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