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quiz2sol_SP2009

# quiz2sol_SP2009 - ECE 53a Quiz#2 SOLUTIONS Pamela Cosman...

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ECE 53a Quiz #2 SOLUTIONS Pamela Cosman 2/11/09 Problem 1: This is Bobrow problem 2.31, which was assigned to you as part of homework set 3. The solution set for the homework was already posted. Problem 2: (a) This problem was taken directly from quiz 2 from last year. The solution set for that was already posted too. But I repeat the solution here: In class, I discussed how to use op amps to scale voltages up and down, including both inverting and non-inverting conFgurations. This problem corresponds to case 4. The conFguration we need is: + V 0 - - + V 1 - + - + V 2 10 K 10 K 10 K (b) Now the ampliFer is no longer an ideal op amp, but rather a Fnite-gain ampliFer with gain A=100. It is still the case, however, that V 2 = V 1 3 where V 1 is the source voltage, because no current goes into the input terminals of the op amp, so the left hand side of the circuit is still doing voltage division. Now we can write

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quiz2sol_SP2009 - ECE 53a Quiz#2 SOLUTIONS Pamela Cosman...

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