Mid2005 - Midterm Examination Intro to Electronics -...

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Midterm Examination Intro to Electronics - ECSE-330A November 10 th 2005, 10:05 AM – 11:25 AM Professor David Plant Pertinent Information: 1) This is a closed-book examination, no notes permitted. 2) The examination consists of 3 problems and 37 total possible points. 3) Only the Faculty Standard Calculator is permitted. 4) This paper will NOT be collected. Write all answers in the answer booklet only.
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Question 1 [12 pts] The circuit shown below is a CBA with an active load. The CBA is biased by a “Wilson” current mirror. You may assume that all BJTs are active and |V BE | = 0.7V. All capacitors have infinite capacitance and all the BJTs are identical. a) (3 pts) Show that in the Wilson current mirror: () 2 2 1 + + = β ref out I I (1) 2
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b) (1 pt) Calculate I out . You can use equation (1). Assume V DD = 5V, R ref = 2k , β = 100 for this part only. c) (3 pts) Draw the small-signal equivalent circuit. You must decide whether or not to include the Early Effect for Q 4 and Q
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Mid2005 - Midterm Examination Intro to Electronics -...

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