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8.049P Refer Figure P8.49 from the text book (a) Calculate the of the collector current of transistor Substitute 3-0.7 2.3 =0.05 mA Therefore the value current 0.05 mA Consider ratio of currents and of their respective transistor areas Here, Ar, represents area Ar, represents area transistor Substitute for Ar, and 0.05 mA for 0.05 m Ar, 0.05 m Therefore the value of the current 0.25 mA Therefore the value current 0.25 mA @ Calculate value of the resistance Substitute 0.25 mA for and 30 30 0.25 m Therefore the value resistance The value of the resistance resistance as the value of the current transistors and Hence the value of the resistance Draw small signal equivalent circuit diagram + of + & Figure Calculate the value o the total resistance collector transistor Substitute and 2(120k) Therefore the value resistance Step 6 of 12 (c) Calculate alue transconductance Substitute 0.25 mA for and mV 0.25 m 25 m the transconductance 10 mA/V Step 7 of 12 Calculate value resistance Substitute and 50 Therefore the value of resistance (d) Consider expression for the input resistance R. input terminals Substitute Therefore the value input Conside expression for the output resistance from the Substitute 2(120k) Therefore value of output resistance Apply nodal analysis =0 the the voltage Apply analysis Substitute of Substitute and and 10 mA/V for (1). 2(120k) Therefore voltage -600 V/V