L3_2 P5.161GroundedEmitterAmp_1

L3_2 P5.161GroundedEmitterAmp_1 - Problem 5.161(Lab 1...

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1 Problem 5.161 (Lab 1) Lecture 3 Part 2 Jan. 15, 2010 β = 100 C μ = 0.8 pF f T = 600 MHz r X = 0 r O = infinity a. Find the dc collector current of the transistor. b. Find g m and r π . c. Neglecting r O , find the midband voltage gain from base to collector (neglect the effect of R B ). d. Use the gain obtained in ( c ) to find the component of R in that arises as a result of R B . Hence find R in . e. Find the overall gain. f. Find C in . g. Find f H .
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2 Solution a. Find dc collector current I C . 1.5 V = R C (I C + I B ) + R B I B + V BE Assume V BE = 0.7 V Use I C = β I B a. g m = I C / V T = 0.54 mA / 0.025 V = 0.54 * 40 mS = 21.6 mS r π = β / g m = 100 / 21.6 mS = 4.63 k Midband Equivalent Circuit V CC = 1.5 V is an ac ground. C C1 C2 are ac short circuits. mA mA I I mA k V R R V V I V I R I R V B C B C B B B B C 54 . 0 0054 . 0 * 100 0054 . 0 148 8 . 0 ( 7 . 0 5 . 1 7 . 0 ) 1 ( 5 . 1 = = = = = + 129 + - = + + + = β
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3 Solution (cont’d) a. If the effect of R B is neglected at the output,
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L3_2 P5.161GroundedEmitterAmp_1 - Problem 5.161(Lab 1...

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