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Simon Fraser University
Faculty of Applied ScienceSchool of Engineering Science
ENSC325
Fall 2013
Final Exam
Sample Problems
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Problem 1:
Calculate the voltage gain of the differential pair depicted on figure below. Assume AV ,
when calculatingmG .
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Problem 2:
The cascade differential pair must achieve a voltage gain of 4000. All transistors are identical
and 200 . What is the minimum early voltage?
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Problem 3:
Using figure below, determine whether or not P is the virtual ground. Show your work
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Problem 4:
Assuming perfect symmetry and AV , compute the differential voltage gain of each stage.
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Problem 5:
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Problem 6:
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Problem 7:
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Problem 8:
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Problem 9:
Prove that P is a virtual ground.
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Problem 10:
The circuit of Figure below must provide a gain of 50 with1 2
5R R k . If , 5A nV V and , 4A pV V ,
calculate the required tail current.