Homework 2
INEL 4202
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The homework consists in solving the following 6 problems.
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Each problem will count for 1 point on the second partial exam.
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You may work in teams of up to 3 students.
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Students from different sections may work on the same team.
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Each team should deliver a single set of solutions.
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Due by september 25 during lecture.
Consider the feedback circuit shown in figure P12.36, with transistor parameters: hf e = 120, VBE,on = 0.7V , and VA = . (a) Determine the small-signal
parameters for Q1 , Q2 and Q3 . Use the feedback method to find: (b) the voltage
gain Avf = vO /vi , (c) the input resistance Rif , and (d) the output resistance
Rof .
12.36
4
12.44
Consider the feedback circuit shown in figure P12.44, with transistor parameters: hf e = 100, VBE,on = 0.7V , and VA = . (a) Determine the small-signal
parameters for Q1 and Q2 . Use the feedback method to find: (b) the current
gain Aif = iO /is , and (c) the input resistance Rif .
5
In the feedback circuit shown in figure P12.52, the transistor parameters
are: hf e = 100, VBE,on = 0.7V , and VA = . Determine the small-signal
parameters for Q1 and Q2 . Find the transconductance gain Agf = iO /vs .
12.52
6
In the feedback circuit shown in figure P12.57, the transistor parameters are:
hf e = 150, VBE,on = 0.7V , and VA = . Determine the small-signal parameters
for Q1 and Q2 . Find the value of RF that will result in a closed-loop voltage
gain Av = vO /vs = 5.0.
12.57

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