mid2002 - Midterm Examination Electronic Circuits I -...

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1 Midterm Examination Electronic Circuits I - ECSE-330A October 17 th 2002, 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 4 problems; 36 total possible points. 3) Only the Faculty Standard Calculator is permitted.
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2 Question #1 [8 pts] : A voltage amplifier with R in = 100k and R o = 100 has the following voltage transfer characteristic: The amplifier is inserted into the following circuit: a) [3 pts] Calculate the value of V DC to get the largest possible output voltage swing v out , without voltage clipping. For parts b) and c) assume the following circuit which includes the amplifier from above: b) [3 pts] Calculate the value of R necessary to provide a DC bias to the input of the amplifier which will permit the largest possible output voltage swing v out , without voltage clipping. c) [2 pts] Calculate the value of R x , the input resistance seen by v s . 4 5 -1 -2 Vin Vout v s v out R S = 10k R L = 100k V DC V s R S = 10k V out R L = 100k R R X 4V
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a) For the largest possible voltage swing, we want to operate at the center of the amplifying region Æ i.e.: when Vin = [5 – (-1)]/2 + (-1) = 2V Further, Vin = V DC *(100k/[10k + 100k]) = 2V Æ V DC = 2.2V b) Still want Vin = 2V = 4V*{(R||R in )/[(R||R in ) + 10k]} Æ R||R in = 10k
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mid2002 - Midterm Examination Electronic Circuits I -...

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